Questions/Answers
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| 1) What is required to implement VLSM? | In order to implement VLSM, a network admin must use a routing protocol that supports it. Cisco routers support VLSM with Open Shortest Path First (OSPF), Integrated IS-IS, Enhanced Interior Gateway Routing Protocol (EIGRP), RIP v2, and static routing.
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| 2) What command is required to use subnet zero? | You must use the “ip subnet zero” command.
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| 3) VLSM should always be used on what types of links? | Point-to-Point links between routers.
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| 4) What does CIDR mean and how is it implemented? | CIDR mean “Classless Interdomain Routing”
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| 5) Why is route aggregation important? | Networks close to one another save routing table space.
Every network needs a separate entry in the routing table.
Each subnet needs separate entry in the routing table.
Route aggregation can reduce the size of the routing table.
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| 6) Why is RIPv1 considered a classful IGP? | Because RIPv1 uses the first octet to determine address class and the network ID.
Classless IGP uses CIDR value to determine the network ID.
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| 7) What are two enhancements/improvements of RIPv2 over RIPv1? | Transmits the subnet mask with route update to enable VLSM support.
RIPv2 provides authentication for enhanced security.
RIPv2 includes a next-hop route IP address in its routing update.
Uses external route tags.
Provides multicast routing upd
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| 8) What command is used to implement RIPv2? | Use the following command: Router(config-router)# version 2
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| 9) What command can be used to confirm RIPv2 has been enabled? | Use the following command: Router# show ip protocols
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| 10) What command can be used to observe routing updates | Use the debug ip rip command to display RIP routing updates as they are sent and received. The no debug all or undebug all commands will turn off all debugging.
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