Q1: R1 has received an OSPF LSU from R2. Which of the following methods can be used by R1 to acknowledge receipt of the LSU from R2?
a. TCP on R1 acknowledges using the TCP Acknowledgment field.
b. R1 sends back an identical copy of the LSU.
c. R1 sends back an LSAck to R2.
d. R1 sends back a DD packet with LSA headers whose sequence numbers match the sequence numbers in the LSU.
Q2:The following routers share the same LAN segment and have the stated OSPF settings:
R1: RID 1.1.1.1, hello 10, priority 3
R2: RID 2.2.2.2, hello 9, priority 4
R3: RID 3.3.3.3, priority 3
R4: RID 4.4.4.4, hello 10, priority 2
The LAN switch fails and recovers, and all routers attempt to elect an OSPF DR and form neighbour relationships at the same time. No other OSPF-related parameters were specifically set. Which of the following are true about negotiations and elections on this LAN?
a. R1, R3, and R4 will expect Hellos from R2 every 9 seconds.
b. R2 will become the DR but have no neighbours.
c. R3 will become the BDR.
d. R4’s dead interval will be 40 seconds.
e. All routers will use R2’s hello interval of 9 after R2 becomes the designated router.
Q3: Which of the following must be true for two OSPF routers that share the same LAN data link to be able to become OSPF neighbours?
a. Must be in the same area
b. Must have the same LSRefresh setting
c. Must have differing OSPF priorities
d. Must have the same hello timer but can have different dead intervals
Q4: What is the Admin Distance for OSPF
a. 90
b. 100
c. 110
d. 120
e. 130
Q5: True or False: Cisco IOS defaults the hello and dead intervals to 30/120 on interfaces using the OSPF nonbroadcast network type
a. True
b. False
Q6: The ip ospf dead-interval minimal hello-multiplier 4 interface subcommand sets the hello interval to 250 ms.
a. 250 ms
b. 4 seconds
c. 12 seconds
d. 400ms
Answers
1: B,C
2: B,D
3: A
4: C
5: A
6: A
The Traceroute Blog 