Level-2 routing exists in ________.

• A.Between different domains
• B.Between ES and IS
• C.Between IS in the same Area
• D.Between different areas

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In the topology shown in the figure, the RTA needs to be configured to introduce the default route in the OSPF area.

Which of the following configurations can achieve the above purpose?

• A.RTA-ospf-1] area 0 RTA-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255 RTA-ospf-1] default-route-advertise alwa
• B.RTA-ospf-1] area 0 RTA-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255 RTA-ospf-1] default-route-advertise
• C.RTA-ospf-1] area 0 RTA-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255 RTA-ospf-1] default-route-advertise alwa RTA] ip route-static 0.0.0.0 0.0.0.0 192.168.0.2
• D.RTA-ospf-1] area 0 RTA-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255 RTA-ospf-1] default-route-advertise RTA] ip route-static 0.0.0.0 0.0.0.0 192.168.0.2

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In the topology shown in the figure, execute the following commands on the RTA router:
RTA-ospf-1] default-route-advertise
RTA] ip route-static 0.0.0.0 0.0.0.0 192.168.0.2
The default route cannot be observed in the routing table of the RTC router. The possible reason is ______

• A.RTA's default route next hop address 192.168.0.2 is unreachable
• B.The default route of RTA does not enter the OSPF area through the import command
• C.Area1 is configured as an NSSA area
• D.A routing policy is configured on the RTC to filter the default route

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The following features that enhance OSPF security are _______

• A.Filter Tpe3 LSAs
• B.Forbid the port to send OSPF packets
• C.Authentication
• D.virtual link

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Configure the silent interface on the router so that the router does not send OSPF protocol messages. The command is _______.

• A.RTA-ospf-1-area-0.0.0.1]silent-interface serial2/0
• B.RTA-Serial2/0]silent-interface
• C.RTA-ospf-1]silent-interface serial2/0
• D.RTA-ospf]silent-interface serial2/0

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