The following output exists on Router R1, a router internal to area 1. What can you d etermine as true from the output of the show ip ospf database summary command?（）

多项选择题R1, an ABR between backbone area 0 and area 1, has intra - area routes in area 0 for 10.1.1.0 24,10.1.2.0 24, and 10.1.3.0 24. These routes have metrics of 21, 22, and 23, respectively. An engineer then adds the area 0 r ange 10.1.0.0 255.255.0.0 command under the OSPF process of R1. Which of the following is true?（）

A. R1 loses and then re - establishes neighborships with all neighbors.
B. R1 no longer advertises 10.1.1.0/24 to neighbors into area 1.
C. R1 advertises a 1 0.1.0.0/16 route into area 1 with a metric of 23 (largest metric).
D. R1 advertises a 10.1.0.0/16 route into area 1 with metric of 21 (lowest metric).

单项选择题Use the same scenario as the previous question, w ith one changE.Instead of the distribute-list prefix question in command configured on R1,R1s OSPF process has an area 1 filter-list prefix question in commandconfigured. Again assuming that the subnets listed in the answers actually exist in area 0. Which of the following occurs on router R1?（） R1#sh ip prefix - list ip prefix - list question: 4 entries seq 5 deny 10.1.2.0 24 ge 25 le 27 seq 15 deny 10.2.0.0 16 ge 30 le 30 seq 20 permit 0.0.0.0 0 le 32

A. R1 will not create/flood a type 3 LSA for su bnet 10.1.2.0/26 into area 1
B. R1 will not create/flood a Type 3 LSA for subnet 10.1.2.0/24 into area 1
C. R1 will not have an OSPF route for subnet 10.1.2.0/26 in its IP routing tablE
D. R1 will not have an OSPF route for subnet 10.1.2.0/24 in its  IP routing tablE

单项选择题The following command output was gathered from Router R1, an ABR between areas 0 (backbone) and area 1. In this internetwork, area 0 contains all the subnets of cla ss A network 10.0.0.0. R1s OSPF process has a distribute - list prefix question in command configured. Assuming the subnets listed in the answers actually exist in area 0. Which of the following occurs on router R1?（） R1#sh ip prefix - list ip prefix - list question: 4 entries seq 5 deny 10.1.2.0 24 ge 25 le 27 seq 15 deny 10.2.0.0 16 ge 30 le 30 seq 20 permit 0.0.0.0 0 le 32

A. R1 will not create/flood a type 3 LSA for subnet 10.1.2.0/26 into area 1
B. R1 will not create/flood a Type 3 LSA for subnet 1 0.1.2.0/24 into area 1
C. R1 will not have an OSPF route for subnet 10.1.2.0/26 in its IP routing tablE
D. R1 will not have an OSPF route for subnet 10.1.2.0/24 in its IP routing tablE

单项选择题Router B1, an internal router in area 1, displays the following output. The only two ABRs connected to area 1 are performing Type 3 LSA filterinG. Which of the following answers is true based on the information in the output from B1?（） R1# show ip route 10.1.0.0 255.255.0.0 longer - prefixes ! Legend lines omitted for brevity 10.0.0.0 8 is variably subnetted, 17 subnets, 3 masks O 10.1.2.0 24 [110 658] via 10.10.13.1, 00:00:32, Serial0 0 0.1 O IA 10.1.1.0 24 [110 658] via 10.10.23.2, 00:41:39, Ser ial0 0 0.2 O IA 10.1.3.0 24 [110 658] via 10.10.23.2, 00:41:39, Serial0 0 0.2

A. A Type 3 LSA for 10.2.2.0/24 was filtered by both ABRs
B. A Type 3 LSA for 10.1.2.0/24 was not filtered by both ABRs
C. A Type 3 LSA for 10.1.3.0/24 was not filtered by  at least one ABR
D. A Type 3 LSA for 10.1.1.0/24 filtered by both ABRs

多项选择题Which of the following LSA types describe information related to topology or subnets useful for calculating routes for subnets inside the OSPF domain?（）

A. 1
B. 2
C. 3
D. 4
E. 5
F. 7