Cisco CCNA Security, final exam.
1. What will be disabled as a result of the no service
password-recovery command ? aaa new-model global configuration
command. change to the configuration register. password encryption
service. ability to access ROMmon.
2. What occurs after RSA keys are generated on a Cisco router to
prepare for secure device management? All vty ports are
automatically configured for SSH to provide secure management. The
general-purpose key size must be specified for authentication with
the crypto key generate rsa general-keys mo command. The keys must
be zeroized to reset secure shell before configuring other
parameters. The generated keys can be used by SSH.
3. Which action best describe a MAC address spoofing attack?
altering the MAC address of an attacking host to match that of a
legitimate host. bombarding a switch with fake source MAC
addresses. forcing the election of a rogue root bridge flooding the
LAN with excessive traffic
4. What functionality is provided by Cisco SPAN in a switched
network? It mitigates MAC address overflow attacks. It mirrors
traffic that passes through a switch port or VLAN to another port
for traffic analysis. It protects the switched network from
receiving BPDUs on ports that should not be receiving them. It
inspects voice protocols to ensure that SIP, SCCP, H.323, and MGCP
requests conform to voice standards. It copies traffic that passes
through a switch interface and sends the data directly to a syslog
or SNMP server for analysis.
5. What precaution should be considered when the no service
passwordrecovery command has been issued on an IOS device? The
passwords in the configuration files are in clear text. IOS
recovery requires a new system flash with the IOS image. When the
password is lost, access to the device will be terminated. The
device must use simple password authentication and cannot have user
authentication.
6. A network technician is configuring SNMPv3 and has set a
security level of auth. What is the effect of this setting?
Authenticates a packet using the SHA algorithm only. Authenticates
a packet by a string match of the username or community string.
Authenticates a packet by using either the HMAC with MD5 method or
the SHA method. Authenticates a packet by using either the HMAC MD5
or HMAC SHA algorithms and encrypts the packet using either the
DES, 3DES or AES algorithms.
7.
Refer to the exhibit. Which type of VPN is implemented?
remote-access GRE VPN remote-access IPsec VPN remote-access SSL VPN
site-to-site GRE VPN site-to-site IPsec VPN site-to-site SSL
VPN
8. Router(config)# ntp authenticate Router(config)# ntp
authentication-key 42 md5 aNiceKey Router(config)# ntp trusted-key
2 Refer to the exhibit. What will be the effect of the commands
that are shown on R1? Authentication with the NTP master will be
successful, and R1 will get the time from the NTP master.
Authentication with the NTP master will be successful, but R1 will
not get the time from the NTP master. Authentication with the NTP
master will fail, and R1 will get the time from the NTP master.
Authentication with the NTP master will fail, and R1 will not get
the time from the NTP master.
9. What login enhancement configuration command helps successive
login DoS attacks? exec-timeout login block-for privilege exec
level service password-encryption
10. What are access attacks? attacks that prevent users from
accessing network services attacks that modify or corrupt traffic
as that traffic travels across the network attacks that exploit
vulnerabilities to gain access to sensitive information attacks
that involve the unauthorized discovery and mapping of systems,
services, and vulnerability
11. Nov 30 11:00:24 EST: %SYS-5-CONFIG-I: Configured from
console by vty0 (10.64.2.2) Refer to the exhibit. An administrator
is examining the message in a syslog server. What can be determined
from the message?
This is a notification message for a normal but significant
condition This is an alert message for which immediate action is
needed This is an error message for which warning conditions exist.
This is an error message indicating the system is unusable
12. Which three major subpolicies should comprise a
comprehensive security policy that meets the security needs of a
typical enterprise? (Choose three) end-user policies departmental
policies governing policies human resource policies organizational
policies technical policies
13. R1(config)# logging host 10.1.1.17 R1(config)# logging trap
errors R1(config)# logging source-interface loopback 0 R1(config)#
logging on Refer to the exhibit. An administrator has entered the
commands that are shown on router R1. At what trap level is the
logging function set? 2 3 5 6
14. Which mitigation technique can help prevent MAC table
overflow attacks? root guard BPDU guard storm control switchport
security
15. An organization requires that individual users be authorized
to issue specific Cisco IOS commands. Which AAA protocols support
this requirement? TACACS+ because it separates authentication and
authorization, allowing for more customization. RADIUS because it
supports multiple protocols, including ARA and NetBEUI. TACACS+
because it supports extensive accounting on a per-user or per-group
basis. RADIUS because it implements authentication and
authorization as one process.
16.
Refer to the exhibit. Based on the IPS configuration that is
provided, which statement is true? The signatures in all categories
will be retired and not be used by the IPS. The signatures in all
categories will be compiled into memory and used by the IPS. Only
the signatures in the ios_ips basic category will be compiled into
memory and used by the IPS. The signatures in the ios_ips basic
category will be retired and the remaining signatures will be
compiled into memory and used by the IPS.
17.
Refer to the exhibit. Based on the provided configuration, which
traffic will be examined by the IPS that is configured on router
R1? Traffic that is initiated from LAN 1 and LAN 2 http traffic
that is initiated from LAN 1 return traffic from the web server
traffic that is destined to LAN 1 and LAN 2 no traffic will be
inspected
18.
Refer to the exhibit. An administrator is configuring ZPF using
the SDM Basic Firewall Configuration wizard. Which command is
generated after the administrator selects the Finish button? zone
security Out-zone on interface Fa0/0 zone security Out-zone on
interface S0/0/0 zone member security Out-zone on interface Fa0/0
zone member security Out-zone on interface s0/0/0
19. Which two statements describe appropriate general guidelines
for configuring and applying ACLs? (Choose two) Multiple ACLs per
protocol and per direction can be applied to an interface. If an
ACL contains no permit statements, all traffic is denied by
default. The most specific ACL statements should be entered first
because of the top-down sequential nature of ACLs. Standard ACLs
are placed closest to the source, whereas Extended ACLs are placed
closest to the destination. If a single ACL is to be applied to
multiple interfaces, it must be configured with a unique number for
each interface.
20. Which three statements are characteristics of the IPsec
protocol? (Choose three) IPsec is a framework of open standards.
IPsec is implemented at Layer 4 of the OSI model. IPsec ensures
data integrity by using a hash algorithm. IPsec uses digital
certificates to guarantee confidentiality IPsec is bound to
specific encryption algorithms, such as 3DES and AES. IPsec
authenticates users and devices that communicate independently.
21. Which three additional precautions should be taken when
remote access is required in addition to local access of networking
devices? (Choose three)
A legal notice should not be displayed when access is obtained.
All activity to the specified ports that are required for access
should be unrestricted. All configuration activities should
required the use of SSH or HTTPS. All administrative traffic should
be dedicated to the management network. The number of failed login
attempts should not be limited, but the time between attempts
should. Packet filtering should be required so that only identified
administration hosts and protocols can gain access.
22. Which statement describes a factor to be considered when
configuring a zone-based policy firewall? An interface can belong
to multiple zones. The router always filters the traffic between
interfaces in the same zone. The CBAC ip inspect command can
coexist with ZPF as long as it is used on interfaces that are in
the same security zones. A zone must be configured with the zone
security global command before it can be used in the zone-member
security command.
23. What is a result of securing the Cisco IOS image using the
Cisco IOS Resilient Configuration feature? The Cisco IOS image file
is not visible in the output of the show flash command. The Cisco
IOS image is encrypted and then automatically backed up to a TFTP
server. The Cisco IOS image is encrypted and then automatically
backed up to the NVRAM. When the router boots up, the Cisco IOS
image is loaded from a secure FTP location
24. What are three common examples of AAA implementation on
Cisco routers? (Choose three) Authenticating administrator access
to the router console port, and vty ports Authenticating remote
users who are accessing the corporate LAN through IPsec VPN
connections Implementing public key infrastructure to authenticate
and authorize IPsec VPN peers using digital certificates
Implementing command authorization with TACACS+ Securing the router
by locking down all unused services Tracking Cisco Netflow
accounting statistics
25. When port security is enabled on a Cisco Catalyst switch,
what is the default action when the maximum number of allowed MAC
addresses is exceeded? The violation mode for the port is set to
restrict. The MAC address table is cleared, and the new MAC address
is entered into the table. The port remains enabled, but the
bandwidth is throttled until the old MAC addresses are aged out.
The port is shut down.
26. Which three statements describe the IPsec protocol
framework? (Choose three) AH uses IP protocol 51. AH provides
encryption and integrity. AH provides integrity and authentication.
ESP uses UDP protocol 50. ESP requires both authentication and
encryption.
ESP provides encryption, authentication, and integrity.
27. Which three statements describe limitations in using
privilege levels for assigning command authorization? (Choose
three.) There is no access control to specific interfaces on a
router. The root user must be assigned to each privilege level
defined. Commands set on a higher privilege level are not available
for lower privileged users Views are required to define the CLI
commands that each user can access. Creating a user account that
needs access to most but not all commands can be a tedious process
It is required that all 16 privilege levels be defined, whether
they are used
28. Which Cisco IOS configuration option instructs the IPS to
compile a signature category named ios_ips into memory and use it
to scan traffic? R1(config)# ip ips signature-category
R1(config-ips-category)# category all
R1(config-ips-category-action)# retired false R1(config)# ip ips
signature-category R1(config-ips-category)# category ios_ips basic
R1(config-ips-category-action)# retired false R1(config)# ip ips
signature-category R1(config-ips-category)# category all
R1(config-ips-category-action)# enabled true R1(config)# ip ips
signature-category R1(config-ips-category)# category ios_ips basic
R1(config-ips-category-action)# enabled true
29.
Refer to the exhibit. An administrator has configured router R1
as indicated. However, SDEE messages fail to log. Which solution
corrects this problem? Issue the logging on command in global
configuration. Issue the ip ips notify sdee command in global
configuration. Issue the ip audit notify log command in global
configuration. Issue the clear ip ips sdee events command to clear
the SDEE buffer.
30. Which three principles are enabled by a Cisco Self-Defending
Network? (Choose three.) adaptability collaboration insulation
integration
mitigation scalability
31. What are two disadvantages of using network IPS?(Choose
two.) Network IPS has a difficult time reconstructing fragmented
traffic to determine if an attack was successful. Network IPS is
incapable of examining encrypted traffic. Network IPS is operating
system-dependent and must be customized for each platform. Network
IPS is unable to provide a clear indication of the extent to which
the network is being attacked. Network IPS sensors are difficult to
deploy whennew networks are added.
32. Which access list statement permits HTTP traffic that is
sourced from host 10.1.129.100 port 4300 and destined to host
192.168.30.10? access-list 101 permit tcp any eq 4300 access-list
101 permit tcp 192.168.30.10 0.0.0.0 eq 80 10.1.0.0 0.0.255.255
access-list 101 permit tcp 10.1.129.0 0.0.0.255 eq www
192.168.30.10 0.0.0.0 eq www access-list 101 permit tcp 10.1.128.0
0.0.1.255 eq 4300 192.168.30.0 0.0.0.15 eq www access-list 101
permit tcp host 192.168.30.10 eq 80 10.1.0.0 0.0.255.255 eq
4300
33. Which type of SDM rule is created to govern the traffic that
can enter and leave the network based on protocol and port number?
NAC rule NAT rule IPsec rule access rule
34 .
Refer to the exhibit. When configuring SSH on a router using SDM
from the Configure menu, which two steps are required? (Choose
two.) Choose Additional Tasks > Router Access > SSH to
generate the RSA keys. Choose Additional Tasks > Router Access
> VTY to specify SSH as the input and output protocol.
Choose Additional Tasks > Router Properties > Netflow to
generate the RSA keys. Choose Additional Tasks > Router
Properties > Logging to specify SSH as the input and output
protocol. Choose Additional Tasks > Router Access > AAA to
generate the RSA keys. Choose Additional Tasks > Router Access
> Management Access to specify SSH as the input and output
protocol
35.
Refer to the exhibit. Which two statements are correct regarding
the configuration on switch S1? (Choose two.) Port Fa0/5 storm
control for broadcasts will be activated if traffic exceeds 80.1
percent of the total bandwidth. Port Fa0/6 storm control for
multicasts and broadcasts will be activated if traffic exceeds
2,000,000 packets per second. Port Fa0/6 storm control for
multicasts will be activated if traffic exceeds 2,000,000 packets
per second. Port Fa0/5 storm control for multicasts will be
activated if traffic exceeds 80.1 percent of the total bandwidth.
Port Fa0/5 storm control for broadcasts and multicasts will be
activated if traffic exceeds 80.1 percent of 2,000,000 packets per
second.
36.
Refer to the exhibit. Which three things occur if a user
attempts to log in four times within 10 seconds using an incorrect
password? (Choose three.) Subsequent virtual login attempts from
the user are blocked for 60 seconds. During the quiet mode, an
administrator can virtually log in from any host on network
172.16.1.0/24. Subsequent console login attempts are blocked for 60
seconds. A message is generated indicating the username and source
IP address of the user. During the quiet mode, an administrator can
log in from host 172.16.1.2. No user can log in virtually from any
host for 60 seconds.
37. Which type of Layer 2 attack makes a host appear as the root
bridge for a LAN? LAN storm MAC address spoofing MAC address table
overflow STP manipulation VLAN attack
38. What occurs after RSA keys are generated on a Cisco router
to prepare for secure device management? All vty ports are
automatically configured for SSH to provide secure management. The
general-purpose key size must be specified for authentication with
the crypto key generate rsa general-keys mo command. The keys must
be zeroized to reset secure shell before configuring other
parameters. The generated keys can be used by SSH.
39. An organization has mobile workers who usecorporate-owned
laptops at customer sites to view inventory and place orders.Which
type of VPN allows these workers to securely access all of
theclient/server applications of the organization? clientless SSL
VPN remote-access IPsec VPN site-to-site IPsec VPN HTTPS-enabled
SSL VPN
40. Which two guidelines relate to in-band networkmanagement?
(Choose two.) Apply in-band management only to devices that must be
managed on the production network. Implement separate network
segments for the production network and the management network.
Attach all network devices to the same management network. Use
IPSec, SSH,or SSL
41. Which three commands are required to configure SSH ona Cisco
router? (Choose three.) ip domain-name name in global configuration
mode transport input ssh on a vty line no ip domain-lookup in
global configuration mode passwordpassword on a vty line service
password-encryption in global configuration mode crypto keygenerate
rsa in global configuration mode
42. Anadministrator needs to create a user account with custom
access to most privileged EXEC commands. Which privilege command is
used to create this custom account? privilege exec level 0
privilege exec level 1 privilege exec level 2 privilege exec level
15
43 .
Refer to the exhibit. An administrator has configureda standard
ACL on R1 and applied it to interface serial 0/0/0 in the
outbounddirection. What happens to traffic leaving interface serial
0/0/0 that does notmatch the configured ACL statements? The
resulting action is determined by the destination IP address. The
resulting action is determined by the destination IP address and
portnumber. The source IP address is checked and, if a match is not
found, traffic isrouted out interface serial 0/0/1. The traffic is
dropped
44. Which statement describes configuring ACLs to controlTelnet
traffic destined to the router itself? The ACL must be applied to
each vty line individually. The ACL is applied to the Telnet port
with the ip access-group command. Apply the ACL to the vty lines
without thein orout option required when applying ACLs to
interfaces. The ACL should be applied to all vty lines in thein
direction to prevent anunwanted user from connecting to an
unsecured port.
45. Which three statements describe SSL-based VPNs? (Choose
three.) A symmetric algorithms are used for authentication and key
exchange. It is impossible to configure SSL and IPsec VPNs
concurrently on the samerouter. Special-purpose client software is
required on the client machine. Symmetric algorithms are used for
bulk encryption. The authentication process uses hashing
technologies. The application programming interface is used to
extensively modify the SSLclient software. The primary restriction
of SSL VPNs is that they are currently supported onlyin
hardware.
46 .
Refer to the exhibit. What information can be obtained from the
AAAconfiguration statements? The authentication method list used
for Telnet is named ACCESS. The authentication method list used by
the consoleport is named ACCESS.
The local database is checked first whenauthenticating console
and Telnet access to the router. If the TACACS+ AAA server is not
available, nousers can establish a Telnet session with the router.
If the TACACS+ AAA server is not available, consoleaccess to the
router can be authenticated using the local database.
47. Which two Cisco IPSmanagement and monitoring tools are
examples of GUI-based, centrally managedIPS solutions? (Choose
two.) Cisco Adaptive Security Device Manager Cisco IPS Device
Manager Cisco Router and Security Device Manager Cisco Security
Manager Cisco Security Monitoring, Analysis, and Response
System.
48 .
Refer to the exhibit.Which AAA function and protocol is in use
in the network? The client is authorizing commands using the
TACACS+protocol. The client is authorizing commands using the
RADIUS protocol. The client is authenticating using the RADIUS
protocol. The client is authenticating using the
TACACS+protocol
49. Which three OSI layers can be filtered by a stateful
firewall? (Choose three.) Layer 2 Layer 3 Layer 4 Layer 5 Layer 6
Layer 7
50 .
Refer to the exhibit. Based on the SDM screenshown, which two
actions will the signature take if an attack is detected?(Choose
two.) Reset the TCP connection to terminate the TCP flow. Drop the
packet and all future packets from thisTCP flow. Generatean alarm
message that can be sent to a syslog server. Drop the packet and
permit remaining packets from this TCP flow. Create an ACL that
denies traffic from the attacker IP address.
51. Which three switch security commands are required to enable
port security on a portso that it will dynamically learn a single
MAC address and disable the port if a host with any other MAC
address is connected? (Choose three.) switchport mode access
switchport mode trunk switchportport-security switchport
port-security maximum 2 switchportport-security mac-address sticky
switchport port-security mac-addressmac-address
52. Whichstatement describes the SDM Security Audit wizard?
After the wizard identifies the vulnerabilities, theSDM One-Step
Lockdown feature must be used to make all
securityrelatedconfiguration changes. After the wizardidentifies
the vulnerabilities, it automatically makes all
security-relatedconfiguration changes. The wizard autosenses the
inside trusted and outside untrusted interfaces todetermine
possible security problems that might exist. The wizard is based on
the Cisco IOS AutoSecure feature. The wizard is enabled using the
Intrusion Prevention task.
53. Which component of AAA is used to determine which resources
a user canaccess and which operations the user is allowed to
perform? Auditing accounting
authorization authentication
54. Which two protocols allow SDM to gather IPS alertsfrom a
Cisco ISR router? (Choose two.) FTP HTTPS SDEE SSH Syslog TFTP
55 .
Refer to the exhibit. Which AAA command logs the activity of a
PPP session? aaa accounting connection start-stop group radius aaa
accounting connection start-stop group tacacs+ aaa accounting exec
start-stop group radius aaa accounting exec start-stop group
tacacs+ aaa accounting network start-stop group radius aaa
accounting network start-stop group tacacs+
56. What is a feature of the TACACS+ protocol? It combines
authentication and authorization as oneprocess. It encrypts
theentire body of the packet for more secure communications. It
utilizes UDP to provide more efficient packet transfer. It hides
passwords during transmission using PAP and sends the rest of
thepacket in plain text.
57 .
Refer to the exhibit. Which interface configuration completes
the CBACconfiguration on router R1? R1(config)# interface fa0/0
R1(config-if)# ip inspect INSIDE in R1(config-if)# ip access-group
OUTBOUND in R1(config)# interface fa0/1 R1(config-if)# ip inspect
INSIDE in R1(config-if)# ip access-group OUTBOUND in R1(config)#
interface fa0/1 R1(config-if)# ip inspect OUTBOUND in
R1(config-if)# ip access-group INSIDE out R1(config)# interface
fa0/0 R1(config-if)# ip inspect OUTBOUND in R1(config-if)# ip
access-group INSIDE in R1(config)#interface fa0/1 R1(config-if)# ip
inspect OUTBOUND in R1(config-if)#ip access-group INSIDE in
58 .
Refer to the exhibit. Which Cisco IOS security feature is
implemented onrouter R2?
CBAC firewall reflexive ACL firewall zone-based policy firewall
AAA access control firewall
59. Which Cisco IOS privileged EXEC command can be used to
verify that theCisco IOS image and configuration files have been
properly backed up and secured? Router# dir Router# show archive
Router# show secure bootset Router# show flash
60. Which device supports the use of SPAN to enable monitoring
of malicious activity? Cisco NAC Cisco IronPort Cisco Security
Agent Cisco Catalyst switch
61. Which three statements describe zone-based policyfirewall
rules that govern interface behavior and the traffic moving
betweenzone member interfaces? (Choose three.) An interface can be
assigned to multiple securityzones. Interfaces can be assigned to a
zone before the zone is created. Pass, inspect,and drop options can
only be applied between two zones. If traffic is to flow between
all interfaces in arouter, each interface must be a member of a
zone. Traffic is implicitly prevented from flowing by default among
interfaces thatare members of the same zone. To permit traffic to
and from a zone member interface, a policy allowing orinspecting
traffic must be configured between that zone and any other
zone.
62.
Refer to the exhibit. Based on the SDM screen shown, which
twoconclusions can be drawn about the IKE policy being configured?
(Choose two.) It will use digital certificates for authentication.
It will use apredefined key for authentication. It will use a very
strong encryption algorithm. It will be the default policy with the
highest priority.
63. The use of 3DES within the IPsec framework is anexample of
which of the five IPsec building blocks? authentication
confidentiality Diffie-Hellman integrity nonrepudiation
64. Which statement describes the operation of the IKE protocol?
It uses IPsec to establish the key exchange process. It uses
sophisticated hashing algorithms to transmit keys directly across a
network. It calculates shared keys based on the exchange of a
series of data packets. It uses TCP port 50 to exchange IKE
information between the security gateways
65. Which three types of views are available when configuring
the Role-BasedCLI Access feature? (Choose three.) superuser view
root view superview CLI view admin view config view
66. Which statement describes a MAC address table overflow
attack? An attacker alters the MAC address in a frame to matchthe
address of a target host. Frames flood the LAN, creating excessive
traffic and degrading network performance. The attacking host
broadcasts STP configuration and topology change BPDUs to force
spanning-tree recalculations. A software tool floods a switch with
frames containing randomly generated sourceand destination MAC and
IP addresses.
67. When configuring a class map for zone-based policy firewall,
how are thematch criteria applied when using the match-all
parameter? Traffic must match all of the match criteria specified
in the statement. Traffic must match the first criteria in the
statement. Traffic must match at least one of the match criteria
statements. Traffic must match according to an exclusive
disjunction criteria.
68. Which three statements describe limitations in using
privilege levelsfor assigning command authorization? (Choose
three.)
There is no access control to specific interfaces on a router.
The root user must be assigned to each privilege level defined.
Commands set on a higher privilege level are not available for
lower privileged users. Views are required to define the CLI
commands that each user can access. Creating a user account that
needs access to most but not all commands can be a tediousprocess.
It is required that all 16 privilege levels be defined, whether
they are usedor not.
69. What is an important difference between network-based and
host-basedintrusion prevention? Host-based IPS is more scalable
than network-basedIPS. Host-based IPS can work in promiscuous mode
or inline mode. Network-based IPS is better suited for inspection
of SSL and TLS encrypted dataflows. Network-based IPS provides
better protection against OS kernel-level attacks onhosts and
servers. Network-basedIPS can provide protection to hosts without
the need of installing specializedsoftware on each one.
70.
Refer to the exhibit. Based on the output from the show secure
bootset command on router R1, which three conclusions can be drawn
regarding Cisco IOS Resilience? (Choose three.)
A copy of the Cisco IOS image file has been made. A copy of the
router configuration file has been made. The Cisco IOS image file
is hidden and cannot be copied, modified, or deleted. The Cisco IOS
image filename will be listed when the show flash command isissued
on R1. The copy tftp flash command was issued on R1. The secure
boot-config command was issued on R1.
71. Which element ofthe Cisco Threat Control and Containment
solution defends against attempts toattack servers by exploiting
application and operating system vulnerabilities? threat control
for email threat control for endpoints
threat controlfor infrastructure threat control for systems
72.
Refer to the exhibit. Based on the SDM NTP Server Details
screen, which two conclusions can be drawn from the information
entered and check boxes checked? (Choose two.) NTPv1 is being
configured. The IP address of the NTP server is 10.1.1.2. The IP
address of the NTP client is 10.1.1.2. NTP messages will be sent
and received on interface Serial0/0/0 for this router. NTP routing
updates will be sent and received on interface Serial0/0/0 of the
NTP server.
73. Which two statements match a type of attack with an
appropriate example?(Choose two.) To conduct an access attack, an
attacker uses L0phtCrack to obtain a Windows server password. To
conduct an access attack, an attacker uses Wireshark to capture
interesting network traffic. To conduct a reconnaissance attack, an
attacker initiates a ping of death attack to a targeted server. To
conduct a DoS attack, an attacker uses handler systems and zombies
to obtain a Windows server password. To conducta DoS attack, an
attacker initiates a smurf attack by sending a large number ofICMP
requests to directed broadcast addresses. To conduct a
reconnaissance attack, an attacker creates a TCP SYN flood causing
the server to spawn many half-open connections and become
unresponsive.
74. The use of which two options are required for IPsec
operation? (Choosetwo.) AH protocols for encryption and
authentication
Diffie-Hellmanto establish a shared-secret key IKE to negotiate
the SA PKI for pre-shared-key authentication SHA for encryption
75. Which three security services are provided by digital
signatures? (Choose three.) authenticatesthe source authenticates
the destination guarantees data has not changed in transit provides
nonrepudiation of transactions provides nonrepudiation using HMAC
functions provides confidentiality of digitally signed data
76. Which three statements should be considered when applying
ACLs to aCisco router? (Choose three.) Place generic ACL entries at
the top of the ACL. Place more specific ACL entries at the top of
the ACL. Router-generated packets pass through ACLs on the router
without filtering. ACLs always search for the most specific entry
before taking any filtering action. A maximum of three IP access
lists can be assigned to an interface perdirection (in or out). An
access list applied to any interface without a configured ACL
allows all traffic to pass.
77. Which consideration is important when implementing syslog in
a network? Enable the highest level of syslog available to
ensurelogging of all possible event messages. Log all messages to
the system buffer so that they can be displayed whenaccessing the
router. Synchronizeclocks on all network devices with a protocol
such as Network Time Protocol. UseSSH to access syslog
information.