CCNA 3 Labs and Study Guide - BINARYBB.INFO – @jagalbraith

108 Switching Basics and Intermediate Routing CCNA 3 Labs and Study Guide
RTA(config)#router ospf 1
RTA(config-router)#network 192.168.1.0 0.0.0.63 area 0
RTA(config-router)#network 192.168.1.244 0.0.0.3 area 0
RTA(config-router)#network 192.168.1.252 0.0.0.3 area 0
8. OSPF routers that share a common link become neighbors on that link. In Figure 2-3, RTB and RTC
are neighbors of RTA, but not of each other. These routers send each other OSPF Hello packets to
establish adjacency. These packets also act as keepalives so that each router knows that adjacent
routers are still functional.
Figure 2-3 Establishing OSPF Adjacency
192.168.1.128/26
9. Using Figure 2-3, document the correct commands, including router prompt, to configure RTB and
RTC to advertise all directly connected networks in OSPF.
!OSPF Configuration for RTB.
!Note that the process-id does NOT have to match with RTA
RTB(config)#router ospf 2
RTB(config-router)#network 192.168.1.64 0.0.0.63 area 0
RTB(config-router)#network 192.168.1.244 0.0.0.3 area 0
!OSPF Configuration for RTB.
RTC(config)#router ospf 3
192.168.1.0/26
RTC RTB
RTC(config-router)#network 192.168.1.128 0.0.0.63 area 0
RTC(config-router)#network 192.168.1.252 0.0.0.3 area 0
Note: Now is a good time to complete Curriculum Lab 2-1: Configuring the OSPF Routing Process (2.3.1).
RTA
192.168.1.252/30 192.168.1.244/30
OSPF
Area 0
192.168.1.64/26
10. On multiaccess networks (networks supporting more than two routers) such as Ethernet and Frame-
Relay networks, the Hello protocol elects a designated router (DR) and a backup designated router
(BDR). Among other things, the designated router is responsible for generating LSAs for the entire
multiaccess network, which reduces both routing-update traffic and management of link-state synchronization.