CCNA 2

SUMMER TRAINING PRESENTATIONON

CISCO CERTIFIED NETWORK ASSOCIATE

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ABOUT CCNA

This certification builds a foundation in and apprentice knowledge of networking.

CCNA certified professionals can install, configure, and operate LAN, WAN and daily access services for small networks (100 modes or fewer), including but not limited to use of these protocols: IP, IGRP, SERIAL FRAME-RELAY, IP RIP, VLANs, RIP ETHERNET, ACCESS-LISTS.

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Router user interfaceThe Cisco IOS software uses a command-line interface (CLI) as the traditional console environment. This environment is accessible through several methods:

Console AUX port (modem) Telnet

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Take the following steps to connect a terminal to the console port on the router: • Connect the terminal using the RJ-45 to RJ-45 rollover cable and an RJ-45 to

DB-9 or RJ-45 to DB-25 adapter. • Configure the terminal or PC terminal emulation software for 9600 baud, 8 data

bits, no parity, 1 stop bit, and no flow control.

Rollover cable

Console port

Com1 or Com2 serial port

Terminal or a PC with terminal emulation software

Router

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• The IOS provides a command interpreter service known as the command executive (EXEC).

• After each command is entered, the EXEC validates and executes the command.

• The levels are user EXEC mode and privileged EXEC mode.

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Router#configure terminalRouter(config)#

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Not recommended, clear text

Router(config)#enable secret <password>

Use this command instead, password is encryped

Encrypts the passwords above, but…

• On serial links that are directly interconnected, as in a lab environment, one side must be considered a DCE and provide a clocking signal.

• The clock is enabled and speed is specified with the clock rate command.

Router(config)#interface serial 0/0

Router(config-if)#clock rate 64000

Router(config-if)#no shutdown

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It is also called Network Traffic Control Management (NTCM). We can provide restrictions to individual users, subnets and services etc.

ACL

Standard ACL Extended ACL

Any access list is identified by its number.

S. A. L 1 – 99

Ex. A. L 100 - 199

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Rules for creating and implementing Access List

1. Access list must begin with the Deny Statements (If exists) then Permit Statements must follow.

2. There must be at least one Permit Statement as an Implicit “Deny All” always exists.

3. While Implementation of Access list, There must be only one Access list per Interface, per direction and per protocol.

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Router A Router B

S 0 172.16.1.1 172.16.1.2 S 0

E 0 5.501.1

1.21.3

1.45.1

5.2

5.4

5.3

E 0 1.50

Syntax

Router(config)# Access-list ALNO P/D Src Src-WCM

Router(config)# Int <name of interface>

Router(Config-if)#Ip Access-Group <Direction>

Layer 2 switching is the process of using the hardware address of devices on LAN to segment a network.

In multiple links between switches we face multi looping problems. To solve this problem switches run Spanning Tree Protocol (STP).

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A VLAN is a logical grouping of network users and resources connected to administratively defined ports on a switched.

A group of users that need an unusually high level of security can be put into its own VLAN so that users outside of the VLAN can’t communicate with them. So it provide security.

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Switch>show vlanSwitch>enableSwitch#vlan database

Switch(vlan)#vlan vlan-id name vlan-nameSwitch(vlan)#exit or ^z.

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• STP is a loop-prevention protocol

• Uses the Spanning Tree Alogithm

• STP allows L2 devices to communicate with each other to discover physical loops in the network.

• STP specifies an algorithm that L2 devices can use to create a loop-free logical topology.

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• By default, STP is enabled for every port on the switch.

• If for some reason STP has been disabled, you can reenable it.

• To re-enable STP, use the

Switch(config)#spanning-tree vlan vlan-id

• To disable STP, on a per-VLAN basis:

Switch(config)#no spanning-tree vlan vlan-id

A packet-switched technology that made its debut in the early 1990s, Frame Relay is a high-performance Data Link and Physical layer specification. An upside to Frame Relay is that it can be more cost effective than point-to-point links, plus it typically runs at speeds of 64Kbps up to 45Mbps (T3). Another Frame Relay benefit is that it provides features for dynamic bandwidth allocation and congestion control.

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Frame RelayNetwork

HeadquartersHub City

Satellite Office 1Spokane

Satellite Office 2Spokomo

172.16.1.1 172.16.1.3

172.16.1.2

DLCI 101

DLCI 102

DLCI 112

DLCI 211

HubCityinterface Serial0ip address 172.16.1.2 255.255.255.0encapsulation frame-relay(Inverse-ARP still works here)

Spokaneinterface Serial0ip address 172.16.1.1 255.255.255.0encapsulation frame-relayframe-relay map ip 172.16.1.3 102frame-relay map ip 172.16.1.2 102

Spokomointerface Serial0ip address 172.16.1.3 255.255.255.0encapsulation frame-relayframe-relay map ip 172.16.1.1 211frame-relay map ip 172.16.1.2 211

Frame-Relay Map Statements

Notice that the routers are configured to use either IARP or Frame Relay maps. Using both on the same interface will cause problems.

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THANK YOUTHANK YOU

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