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Question 21

Run the command and display information on the router as follows:
<RTA>displaisis brief
ISIS(1) Protocol Brief Information:
network-entit:
01.1111.1111.1111.00
is-level: level-1-2
cost-ste: narrow
preference: 15
Lsp-length receive: 1497
Lsp-length originate: level-1 1476
level-2 1476
maximum imported routes number: 10000
Timers:
lsp-max-age: 1200
lsp-refresh: 900
Interval between SPFs: 10
From the above information, you can know RTA______.

Question 22

As shown in the figure, the actual bandwidth of the Ethernet interface E1/0 of the MSR router is 10Mbps, and the actual link bandwidth of the serial port S2/0 is 64Kbps.

In order to preferentially use high-bandwidth links and achieve the purpose of route backup, which of the following solutions is the most reasonable?

Question 23

Among the following routing protocols, the one belonging to the IGP is ______, and the one that uses the link state algorithm is ______.

Question 24

In the topology shown in the figure, by executing the import-route direct command on the RTA, 192.168.0.0/24, 192.168.1.0/24, 192.168.2.0/24, 192.168.3.0/24 and 192.168.4.0/24 are injected. Five routes, and perform the following configurations on RTA, RTB and RTC respectively:
RTA]ospf 1
RTA-ospf-1]area 1
RTA-ospf-1-area-0.0.0.1]network 10.0.0.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]nssa
RTA-ospf-1]asbr-summar192.168.0.0 255.255.192.0 not-advertise
RTA-ospf-1]import direct
RTB]ospf 1
RTB-ospf-1]area 1
rtb-ospf-1-area-0.0.0.1]network 10.0.0.0 0.0.0.255
RTB-ospf-1-area-0.0.0.1]nssa default-route-advertise
RTB-ospf-1-area-0.0.0.1]area 0
RTB-ospf-1-area-0.0.0.0]network 20.0.0.0 0.0.0.255
RTB-ospf-1]import direct
rtc]ospf 1
RTC-ospf-1]area 0
rtc-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
RTC-ospf-1-area-0.0.0.0]network 20.0.0.0 0.0.0.255 The impossible routes in the RTC routing table are _____

Question 25

In the topology shown in the figure, perform the following configuration in RTA:
RTA-ospf-1-area-0.0.0.1]network 192.168.0.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 192.168.1.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 192.168.2.0 0.0.0.255
RTA-ospf-1-area-0.0.0.1]network 192.168.3.0 0.0.0.255
Now it is required that the RTC cannot learn the route 192.168.2.0/24 configured in the above RTA, what configuration can be performed on the router?