In BGP, which of the following are methods for loop avoidance?
A. The Origin attribute of a route records the source from which the route was imported
B. In a route's AS-Path attribute, all Ass along the path are recorded.
C. In the next-hop attribute of a route, the route's next hop is recorded.
D. The MED attribute of a route affects the outbound interface selection of another AS.
What kind of BGP packet contains routing information?
A. Open
B. Update
C. Keepalive
D. Notification
For a router that runs BGP4, which of the following statements is not true?
A. When multiple paths exist, BGP4 selects the optimal path.
B. BGP notifies the routes obtained from EBGP to all its BGP peers.
C. BGP advertises to BGP peers only the routes it uses.
D. BGP4 notifies the routes obtained from IBGP to all its BGP peers.
What kind of packet is used by BGP to transmit version number and AS number information?
A. Open
B. Update
C. Keepalive
D. Notification
Which of the following statements are true about the comparison between OSPF and IS-IS? (Choose all that apply.)
A. OSPF runs on the IP layer, and IS-IS runs on the data link layer.
B. For IS-IS, a router belongs to multiple areas, but in OSPF, a router can belong to only one area.
C. DIS election in IS-IS is simple, preemptive, and can be predicted. DR election in OSPF is unpredictable and non-preemptive.
D. OSPF supports P2P/P2MP/NBMA/broadcast networks. IS-IS supports only P2P and broadcast networks.
Which of the following statements are true about the DIS in IS-IS? (Choose all that apply.)
A. A DIS creates and updates pseudo nodes on a broadcast network.
B. DIS election is unpredictable.
C. When all IS priorities are the same within a LAN, the IS with the largest MAC address is elected as the DIS.
D. DIS election on a broadcast network is held in preemption mode.
In OSPF, which of the following statements is true within a given area (area A)?
A. The LSA generated by each router is the same.
B. The LSDB of area A of each router is the same.
C. The shortest path tree calculated based on the LSDB of each router is the same.
D. The route calculated based on each router's shortest path tree is the same.
Which statements about the link-state algorithm are true? (Choose all that apply.)
A. The link state is the description of a route.
B. The link state describes the network topology.
C. The link state algorithm does not generate route loops.
D. OSPF and RIP use the link state algorithm.
On a P2P IS-IS network, which of the following is true about the use of PSNP packets?
A. Confirm receipt of LSPs.
B. Discover neighbors.
C. Set up adjacencies.
D. Select the DIS.
Which of the following statements is true about the IS-IS backbone area?
A. A router belongs to all areas.
B. All routers belong to the same area.
C. This area comprises a series of continuous L2 routers and L1-L2 routers.
D. This area is central area connected to other areas.
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