Cisco Certified Network Associate (CCNA) Practice Exam

Which command initializes EIGRP with a specific autonomous system (AS) number?

1. router eigrp AS NUMBER

2. network NETWORK TO BE ADVERTISED

3. passive-interface INTERFACE NUMBER

4. maximum-paths NUMBER

The correct answer is: router eigrp AS NUMBER

The command to initialize EIGRP (Enhanced Interior Gateway Routing Protocol) with a specific autonomous system number is structured as "router eigrp AS NUMBER". This command is crucial because it sets up the EIGRP routing process on a router and specifies which autonomous system the EIGRP process will belong to. The autonomous system number essentially identifies a set of routers that will participate in the EIGRP routing protocol, allowing them to share routing information. The command establishes the EIGRP routing domain, ensuring that only routers within the same configured autonomous system can communicate and exchange routing information. This is fundamental for the correct operation of EIGRP, as routers in different autonomous systems will not share routes. Other commands listed serve different purposes within EIGRP and network configuration but are not used for initializing EIGRP with an autonomous system number. For example, the command that deals with the network to be advertised is used to define which interfaces will participate in EIGRP, while commands related to passive interfaces and maximum paths handle interface behaviors and routing table management respectively. However, they do not directly initiate the EIGRP process with an AS number.