Chapter 3: Open Shortest Path First

Question 1

6 - You run the operational-mode command show ospf neighbor and notice an expected OSPF neighbor on a broadcast link is not detected. Which three issues cause this behavior?(Choose three)

A. A problem exists with the physical link or Data Link Layer connectivity.
B. The router IDs on the two devices do not match.
C. The IP subnet mask does not match on each end of the link.
D. The area type does not match on each end of the link.
E. The AS number on the two devices do not match.

Answer 1

A. A problem exists with the physical link or Data Link Layer connectivity.
C. The IP subnet mask does not match on each end of the link.
D. The area type does not match on each end of the link.

Question 2

13 - You must route both IPv4 and IPv6 packets in your environment. Which configuration should you add at the [edit protocols] level to allow you to accomplish this objective?

A.  ospf {
area 0.0.0.0 {
interface all ;  }}
B. ospf{
area 0.0.0.0. {
interface all;
family inet6;  }}
C. ospf3 {
area 0.0.0.0{
interface all;}}
D.  ospf3 {
area 0.0.0.0 {
interface all; 
allow ipv4;
}}

Answer 2

C. ospf3 {
area 0.0.0.0{
interface all;}}

Question 3

15 - You see a route in your local routing table that was learned using OSPF. Which command allows you to determine where the route originated?

A. show ospf route
B. show route protocol ospf
C. show ospf database
D. show ospf log

Answer 3

C. show ospf database

Question 4

68 - Which statement describes the operation of a stub area?

A. A stub area receives only a default route.
B. A stub area receives all routes from all other areas.
C. A stub area receives no external routes from other areas.
D. A stub area is automatically configured based on the presence of the E-Bit in the hello messages sent from the ABR.

Answer 4

C. A stub area receives no external routes from other areas.

Question 5

69 - Which type of protocol is OSPF?

A. link-state protocol
B. distance-vector protocol
C. path-vector protocol
D. modified distance-vector protocol

Answer 5

A. link-state protocol

Question 6

70 - Why does a router create an ASBRSum(type 4) LSA?

A. An ABR creates an ASBRSum(type 4) LSA with the information contained in NSSA (Type 7) LSAs it receives from NSSAs
B. An ABR creates an ASBRSum (Type 4) LSA to describe the router ID of ASBRs located in other areas.
C. An ASBR creates an ASBRSum (Type 4) LSA to describe its router ID so that routers in other areas can reach the external networks it advertises.
D. An ABR creates an ASBRSum (Type 4) LSA to summarize routes received from other areas.

Answer 6

B. An ABR creates an ASBRSum (Type 4) LSA to describe the router ID of ASBRs located in other areas.

Question 7

71 - For two OSPF neighbors to establish a full adjacency on a broadcast medium, what information is their hello packets mush match? (Choose two).

A. network mask
B. router priority
C. dead interval
D. the list of neighbors on the network

Answer 7

A. network mask

C. dead interval

Question 8

73 - Which protocol is an IGP?

A. LACP
B. STP
C. OSPF
D. PAGP

Answer 8

C. OSPF

Question 9

You run the operational-mode command show ospf neighbor and notice that an expected OSPF neighbor on a broadcast link is not detected. Which three issues cause this behavior? (Choose three.)

A.
A problem exists with the physical link or Data Link Layer connectivity.

B.
The router IDs on the two devices do not match.

C.
The IP subnet mask does not match on each end of the link.

D.
The area type does not match on each end of the link.

E.
The AS number on the two devices do not match.

Answer 9

A.
A problem exists with the physical link or Data Link Layer connectivity.
C.
The IP subnet mask does not match on each end of the link.

D.
The area type does not match on each end of the link.