View the Exhibit. You administer the network shown above. RouterA and RouterB are configured to use EIGRP. Automatic summarization is enabled. What network or networks will RouterA advertise to RouterB?
A.
172.16.0.0/16
B.
172.16.0.0/22
C.
172.16.0.0/23 and 172.16.3.0/24
D.
172.16.0.0/24, 172.16.1.0/24, and 172.16.3.0/24
Suggested Answer:A🗳️
Section: Addressing and Routing Protocols in an Existing Network Explanation
RouterA will advertise the 172.16.0.0/16 network to RouterB. When the auto-summary command has been used to enable automatic summarization on a router, Enhanced Interior Gateway Routing Protocol (EIGRP) automatically summarizes networks on classful boundaries. Summarization minimizes the size of routing tables and advertisements and reduces a router's processor and memory requirements. Summarization is also useful in limiting the scope of EIGRP queries. The 172.16.0.0/24, 172.16.1.0/24, and 172.16.3.0/24 networks in this scenario use Class B addresses. Therefore, these network ranges are summarized to the Class B boundary, which is /16. Subnetting a contiguous address range in structured, hierarchical fashion enables routers to maintain smaller routing tables and eases administrative burden when troubleshooting. Conversely, a discontiguous IP version 4 (IPv4) addressing scheme can cause routing tables to bloat because the subnets cannot be summarized. To disable automatic summarization in an EIGRP configuration, you should issue the no auto-summary command. The no auto-summary command enables EIGRP to advertise the actual networks, not the classful summary. You should use the no auto-summary command when a classful network is divided and portions of the same classful network exist in different parts of the network topology. If you were to issue the no auto-summary command on RouterA, RouterA would advertise the individual network ranges and subnet mask information to RouterB. You can issue the ip summary-address eigrp command to enable manual summarization. Manual summarization is configured on a per-interface basis. The syntax of the ip summary-address eigrp command is ip summary-address eigrp as number address mask, where as-number is the EIGRP autonomous system (AS) number, address is the summary address, and mask is the subnet mask in dotted decimal notation. Reference: Cisco: Cisco IOS IP Routing: EIGRP Command Reference: auto-summary (EIGRP)
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