Foundation Summary

Study Material For Cisco Ccna Ccnp And Ccie Students

Study Material For Cisco Students

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The "Foundation Summary" section of each chapter lists the most important facts from the chapter. Although this section does not list every fact from the chapter that will be on your CCNA exam, a well-prepared CCNA candidate should know, at a minimum, all the details in each "Foundation Summary" before going to take the exam.

The ip address interface subcommand assigns an IP address and mask to an interface. If the associated interface is also in an up and up status, the router adds a connected route to the routing table for the subnet connected to that interface. Example 13-12 shows an example configuration with the resulting connected routes.

Example 13-12 Albuquerque Router Configuration and Connected Routes Albuquerque#configure terminal

Enter configuration commands, one per line. End with CNTL/Z. Albuquerque(config)#interface serial 0

Albuquerque(config-if)#ip address 10.1.128.251 255.255.255.0

Albuquerque(config)#interface serial 1

Albuquerque(config-if)#ip address 10.1.130.251 255.255.255.0 Albuquerque(config)#interface ethernet 0

Albuquerque(config-if)#ip address 10.1.1.251 255.255.255.0

Albuquerque#show ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/24 is subnetted, 3 subnets C 10.1.1.0 is directly connected, Ethernet0

C 10.1.130.0 is directly connected, Serial1

C 10.1.128.0 is directly connected, Serial0

Table 13-9 summarizes the key naming commands in IOS. Table 13-9 IP Naming Commands

Function

Command Options

Tell IOS to use a DNS

Configure the ip domain-lookup global configuration command.

Configure IP addresses of name servers

Configure the ip name-server svr1 svr2... global configuration command.

Configure static host names

Use the ip host name address command.

List current host name information

Use the show hosts exec command.

Table 13-10 summarizes the commands related to Telnet. Table 13-10 Telnet Command Options

Function

Command Options

Telnet to another device

Use the telnet exec command.

Just type the host name or IP address from exec mode.

Suspend a Telnet session

Press the key sequence Ctrl-Shift-6, then x.

Discover currently suspended Telnet session

Use the where exec command.

Use the show sessions exec command.

Resume a suspended Telnet session

Use the resume command, with no parameter, to reconnect to the most recently suspended Telnet session.

Use the resume x command, where x is the number of the suspended Telnet session based on the output of show sessions.

Just press Enter in exec mode to resume to the most recently suspended Telnet session.

Terminate a suspended Telnet session

Resume connection, and log out using the quit command. Use the disconnect command on the router you Telnetted from.

CDP discovers several useful details from neighboring networking devices, including the following. You also should review the actual CDP commands in the chapter and memorize which commands provide which details.

■ Device identifier—Typically the host name

■ Address list—Network and data-link addresses

■ Port identifier—Text that identifies the port, which is another name for an interface

■ Capabilities list—Information on what type of device it is—for instance, a router or a switch

■ Platform—The model and OS level running in the device

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