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61.
Which of the following settings do not prevent two potential OSPF neighbors from
becoming neighbors?
- A.The interface used to connect to that neighbor being passive in the OSPF process
- B.Duplicate OSPF router IDs
- C.Mismatched Dead timers
- D.IP addresses of 10.1.1.1/24 and 10.2.2.2/24
- E.Mismatched OSPF process IDs
- Answer & Explanation
- Report
Answer : [E]
Explanation :
Explanation :
| For OSPF, Router IDs must be unique, the interfaces must not be passive, the dead timers must match, and the primary IP addresses must be in the same subnet, with the same subnet mask. However, the process IDs, found in the router ospf process-id command, do not have to match. |
62.
A company has a Frame Relay WAN with one central-site router and 100 branch
office routers. A partial mesh of PVCs exists: one PVC between the central site and
each of the 100 branch routers. All routers use point-to-point subinterfaces and one
subnet per PVC. Which of the following is true about OSPF in this design?
- A.The central-site router has 100 fully adjacent neighborships with the 100 branches.
- B.The central-site router has neighborships with all branch routers, but fully adjacent neighborships with only two branches.
- C.The central-site router has a neighborship with the Frame Relay switch
- D.None of the other answers is correct.
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| Frame Relay is a Layer 2 service and as such does not participate in customer routing protocols. Because the design uses a separate subnet per PVC, and one point-to-point subinterface per PVC/subnet, OSPF will use a point-to-point network type. That means that the two routers on either end of a PVC will become neighbors, and become fully adjacent, meaning that the central-site router will have 100 fully adjacent neighborships. |
63.
Which of the following answers can be verified as true based on the following command
output from Router R1?
R1# show ip ospf virtual-links Virtual Link OSPF_VL0 to router 4.4.4.4 is up Run as demand circuit DoNotAge LSA allowed. Transit area 1, via interface FastEthernet0/1, Cost of using 3?
- A.R1 is configured with an area 0 virtual-link 4.4.4.4 cost 3 command.
- B.The ping 4.4.4.4 command on R1 must currently be successful.
- C.R1's Fa0/1 OSPF cost is 3.
- D.4.4.4.4 is known to R1 based on a Type 1 LSA in area 1.
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
|
The answer with area 0 virtual-link 4.4.4.4 cost 3 is incorrect, because the show
command output lists a transit area of 1, but the answer's area parameter refers to
area 0 as the transit area. (There is also no cost parameter on the area virtual-link
command.) The RID of the router on the other end of the virtual link, 4.4.4.4 per the
show command output, does not have to be pingable for the virtual link to work. The cost of the virtual link is 3, but that cost is calculated as the cost to reach the other router through the transit area, so the command output listed with the question cannot be used to predict Fa0/1's OSPF interface cost alone. However, because the output lists area 1 as the transit area, and because the neighbor RID is listed as 4.4.4.4, R1 will use the area 1 LSDB entries to calculate the cost to reach 4.4.4, a process that will include the area 1 Type 1 LSA for RID 4.4.4.4. |
64.
Several links have been broken so that for the next day or two, what was formerly
a contiguous area 0 has been broken into two parts. However, both parts of area
0 have working links into area 1 using routers with RID 1.1.1.1 and 2.2.2.2. Which
answer lists the command on the router with RID 1.1.1.1 to create a virtual link to
help solve this temporary problem?
- A.area 0 virtual-link 2.2.2.2
- B.area 1 virtual-link 2.2.2.2
- C.area 0 source-rid 1.1.1.1 dest-rid 2.2.2.2
- D.virtual-link transit-area 1 RID 2.2.2.2
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| The area virtual-link command defines the virtual link, with the transit area—the area through which the virtual link passes—listed as the first parameter. The other parameter is the RID of the other router. Two of the wrong answers are not Cisco IOS commands. |
65.
Under what configuration mode for Named EIGRP would you configure variance?
- A.Address-Family configuration mode
- B.Address-Family-interface configuration mode
- C.Address-Family-Global configuration mode
- D.Address-Family-Topology configuration mode
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
|
General EIGRP commands (for example, metric , eigrp stub , and eigrp router-id )
are configured under address-family configuration mode. Commands entered under interface configuration mode with a traditional EIGRP configuration (for example, authentication , bandwidth-percent , hello-interval , holdtime , passive-interface , and split-horizon ) are entered under address-family-interface configuration mode with Named EIGRP. Commands having a direct impact on a router's EIGRP topology (for example, autosummary , maximum-paths , redistribute , and variance ) are given under addressfamily- topology configuration mode. There is no address-family-global configuration mode. |
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