ICT169 Session 8 - 1

(Choose two) Which of the following applies to the router ID?

• The router ID cannot be defined by an administrator

• The router ID is not used to determine the BDR

• The router ID is used to determine the DR

• The router ID uniquely identifies the router

• The router ID is not required

Which command could be used on a router to ensure that an OSPF adjacency is formed with another router?

• show ip ospf neighbor

• show ip ospf interface

• show ip protocols

• show ip route

What is the first criterion used by OSPF routers to elect a DR?

(Designated Router)

• highest priority

• highest MAC address

• highest router ID

• highest IP address

(Choose two)

What are two features of the OSPF routing protocol?

• calculates its metric using bandwidth

• used primarily as an EGP

• uses Dijkstra's algorithm to build the SPF tree

• has an administrative distance of 100

(Choose three)

Which three parameters should match in order for a pair of routers to form an adjacency when running OSPFv2?

• OSPFv2 type of network

• subnet mask

• hello timer

• interface priority

• router ID

Which wildcard mask would be used to advertise the 192.168.5.96/27 network as part of an OSPF configuration? 

• 255.255.255.223

• 255.255.255.224

• 0.0.0.31

• 0.0.0.32

Answer explanation

• To advertise the network 192.168.5.96/27, you need to determine the wildcard mask. The wildcard mask is the inverse of the subnet mask. In this case, the subnet mask for the network 192.168.5.96/27 is 255.255.255.224.

  To calculate the wildcard mask, you subtract each octet of the subnet mask from 255. So:

• • 255 - 255 = 0

  • 255 - 255 = 0

  • 255 - 255 = 0

  • 255 - 224 = 31

  The wildcard mask for the network 192.168.5.96/27 is 0.0.0.31.

Which statement is correct about multiarea OSPF?

• All routers are in one area called the backbone area (area 0 )

• Arranging routers into areas, partitions a large autonomous system in order to lighten the load on routers

• OSPF multiarea increases the frequency of SPF calculation

• OSPF can consolidate a fragmented OSPF area into one large area

What is identical on all OSPF routers within a single area?

• static routes

• routing table

• link-state database

• neighbour table

Which of the following is used with the Hello Packet to uniquely identify the originating router?

• Hello interval

• Router ID

• Designated Router ID

• Network Mask

• Dead Interval

(Choose two)

What are two reasons why an administrator might choose to use static routing rather than dynamic routing?

• Static routing is more scalable

• Static routing is more secure

• Static routing uses less router processing and bandwidth

• Static routing is easier to maintain in large networks

• Static routing does not require complete knowledge of the whole network