Which Command do you enter so that R1 advertises the loopback0 interface to the BGP Peers?

Refer to the exhibit. Which Command do you enter so that R1 advertises the loopback0 interface to the BGP Peers?
A. Network 172.16.1.32 mask 255.255.255.224
B. Network 172.16.1.0 0.0.0.255
C. Network 172.16.1.32 255.255.255.224
D. Network 172.16.1.33 mask 255.255.255.224
E. Network 172.16.1.32 mask 0.0.0.31
F. Network 172.16.1.32 0.0.0.31

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9 thoughts on “Which Command do you enter so that R1 advertises the loopback0 interface to the BGP Peers?

  1. When you use any of the IGPs (RIP, OSPF or EIGRP) then the network command is used to activate the IGP on all interfaces that fall within the range of the network command.

    BGP doesn’t care about interfaces, it doesn’t even look at them. When we use the network command in BGP then BGP will only look at the routing table. When it finds the network that matches the network command, it will install it in the BGP table.

  2. Host id is the last 5 digits,
    .33 under .224 will be: 172.16.1.32 (0010 0000), i.e. the host ID all 0s
    .32 under .224 will be:172.16.1.33 (0010 0001), i.e. the host ID isnt all 0s (with that 1)
    An IP is required for the interface but not the IP for the subnet, thus the ans is A.

  3. Question here is “so that R1 advertises the loopback0 interface” and correct answer is D.
    Network 172.16.1.33 mask 255.255.255.224.
    They asking for LOOPBACK interface not loopback subnet

  4. A is the right answer because “With BGP, you must advertise the correct network and subnet mask in the “network” command”

    1. mask is .224 that means each network have 30+2 hosts, then .32 is network , and .33 is the first host that can be used

      1. The loopback0 interface can have any address from the subnet, not necessarily the last one, or first, right?

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