In the network shown in the figure, R1, R2, R4, and R5 run IS-IS, and the area number is
49.0001. R3 and R6 run IS-IS, and the area number is 49.0002. In AS 65000, R1, R3, R4, and R6 all establish IBGP neighbor relationships with R2 and R5, of which R2 and R5 are RRs. R1, R4, R3, and R6 are clients, and IBGP neighbor relationships are all established using the Loopback0 interface. The IP address of the Loopback0 interface of each device is 10.0.XX/32.
The Router ID is 10.0.XX, where X is the device number. R1 and R4 introduce the external network 192.168.1.0/24 into BGP through import, and R3 and R6 introduce the external network
192.168.2.0/24 into BGP through import.

Which of the following descriptions are correct by default? (Multiple choice)

In an MPLS network, an LSR ID is used to uniquely identify an LSR (Label Switching Router).
The LSR ID defaults to the IP address of a physical interface of the device and can be manually configured as the loopback interface address.

In the hub-spoke networking shown in the figure, to ensure correct route transmission, an administrator must manually configure the peer 10.1.2.1 _____ command in the IPv4 address family view of the BGP-VPN_out instance on the Hub-PE.

(Enter the answer in lowercase letters only.)

As shown in the OSPF network, the area number has been marked in the figure, where Area 1, Area 2, and Area 3 are all common areas. The IP address of the R5 Loopback0 interface is
10.0.5.5/32, and the interface enables OSPF through the network method.

On the GE0/0/1 interface of R5 and the GE0/0/2 interface of R1, "ospf filter-Isa-out all" is configured. Which of the following routers' routing tables do not contain a route entry for
10.0.5.5/32? (Multiple choice)

Both VLAN aggregation and MUX VLAN are deployed in a certain enterprise network, and the interfaces connecting the switches to the terminals are all Access interfaces.

in the scenario shown in the figure, which of the following IP addresses can PC3 access?
(Multiple choice)