Information Technology Reference
In-Depth Information
3.
B. OSPF defines the ASBR as the router that injects external routes into the OSPF
autonomous system.
4.
E. OSPFv2 Type 5 LSAs are autonomous system external LSAs.
5.
C. OSPFv2 routers use 224.0.0.6 to communicate with DRs.
6.
A. Type 1 LSAs (router LSAs) are forwarded to all routers within an OSPF area.
7.
D. Intra-area-prefix LSAs carry IPv6 prefixes associated with a router, a stub network,
or an associated transit network segment.
8.
B. You use External Border Gateway Protocol (eBGP) to exchange routes between
autonomous systems.
9.
B. It is a best practice to summarize routes on the distribution routers toward the core.
10.
B. You use IGMP between hosts and local routers to register with multicast groups.
11.
B. The lower 23 bits of the IP multicast address are mapped to the last 23 bits of the
Layer 2 MAC address.
12.
A. The administrative distance of eBGP routes is 20. The administrative distance of
Internal BGP (iBGP) routes is 200.
13.
D. CIDR provides the capability to forward packets based on IP prefixes only, with no
concern for IP address class boundaries.
Q&A
1.
False. A router with one or more interfaces in Area 0 is considered an OSPF backbone
router.
2.
Tr ue
3.
224.0.0.5 for ALLSPFRouters and 224.0.0.6 for ALLDRouters.
4.
FF02::5 for ALLSPFRouters and FF02::6 for ALLDRouters.
5.
The administrative distance of OSPF is 110.
6.
OSPF ABRs generate the Type 3 summary LSA for ABRs.
7.
OSPF DRs generate Type 2 network LSAs.
8.
Included are the router's links, interfaces, state of links, and cost.
9.
False. The router with the highest priority is selected as the OSPF designated router.
10.
False. You use eBGP to exchange routes between different autonomous systems.
11.
False. BGPv4 added support for classless interdomain routing (CIDR), which provides
the capability of forwarding packets based on IP prefixes only, with no concern for
the address class.
12.
Tr ue
13.
20, 200
