OSPF and IS-IS Routing Protocol Quiz

In an enterprise office network, two directly connected routers have enabled OSPF routing protocol. When establishing a neighbor relationship, the state machine remains stuck in the 2-way state. Which of the following is not a possible reason for this phenomenon?

• Mismatch in N-bit and E-bit of packets

• Mismatch in Hello time

• Mismatch in Area ID

• Router-ID conflict

In an OSPF network, when establishing an OSPF neighbor relationship, for which of the following network types must it be ensured that they are in the same network segment and have matching masks?

• P2MP

• Point-to-point

• Broadcast

• NBMA

In an OSPF network, the OSPF neighbor table is one of the important tables maintained by OSPF. Which of the following descriptions about this table are correct?

• Before OSPF transmits LSAs, an OSPF neighbor relationship needs to be established.

• The OSPF neighbor table saves link state information between OSPF routers.

• OSPF neighbor relationships are established by exchanging Hello packets.

• The OSPF neighbor table can be viewed using the command display ospf peer.

An enterprise uses the OSPF routing protocol to implement network communication. The output of the command display ospf lsdb on a router is shown below. Which of the following descriptions about this device are correct?

• The aging time of the Type-3 LSA advertised by R1 is 286.

• The Router-ID of R1's neighbor is 10.2.2.2.

• R1 is running in the OSPF backbone area.

• R1 is an ASBR device.

In an OSPF network, the inter-area routing mechanism requires all non-backbone areas to be directly connected to the backbone area. If a non-backbone area is not directly connected to the backbone area, it can be resolved by configuring a virtual link. Which of the following descriptions about virtual links are correct?

• Virtual links can be used to optimize OSPF paths.

• Virtual links can be used in scenarios where the backbone area is partitioned.

• Virtual links comply with OSPF inter-area routing rules.

• The virtual link configuration view is the OSPF process view.

In which of the following scenarios will two directly connected Huawei routers definitely fail to establish a neighbor relationship after configuring the IS-IS routing protocol?

• One router is a Level-1 router, and the other is a Level-2 router.

• Both routers are Level-1 routers, and their Area Addresses are different.

• Both routers are Level-2 routers, their Area Addresses are the same, and the connected interfaces are in the same network segment.

• Both routers are Level-2 routers, but their Area Addresses are different.

In an IS-IS network, each router can generate an LSP. When encountering which of the following events, will it trigger the generation of a new LSP?

• Adjusting the cost of an IS-IS interface.

• An IS-IS related interface going Up or Down.

• Changes in inter-area IP routes.

• Periodic updates.

As shown in the figure, R1 advertises a BGP route to an EBGP peer. Which of the following descriptions about this process are correct?

• R1 only sends incremental updates for routes.

• When R2 receives this route and propagates it to R3, it will keep the Next_Hop attribute of the route unchanged.

• This route includes the Origin attribute of this route.

• The Next_Hop attribute in this route is its own UDP connection source address.

Which of the following statements about basic BGP concepts are correct?

• A device that sends BGP messages is called a BGP Speaker. It receives or generates new message information and publishes it to other BGP Speakers.

• A BGP Router ID is a 32-bit value used to identify a BGP device. Every BGP device must have a unique Router ID; otherwise, a BGP connection cannot be established between peers.

• BGP running within the same AS is called iBGP. To quickly propagate routes, BGP devices advertise routes learned from iBGP peers to other iBGP peers.

• BGP running between different ASes is called eBGP. To prevent inter-AS routing loops, when a BGP device receives a route advertised by an eBGP peer, it discards routes that carry its own AS number.

If a Route Reflector (RR) is deployed in a BGP peer group, what reflection rules does it need to follow?

• Routes learned from clients are only advertised to all non-clients.

• When a Route Reflector performs route reflection, it only reflects the best BGP routes it uses.

• Routes learned from non-clients are only advertised to all clients.

• Routes learned from an EBGP peer are advertised to all non-clients and clients.