Answer to Question #311659 in Computer Networks for kev

Question

BranchRouter >> HQRouter

network: 209.165.165.0

Mask: 255.255.255.252

Prefix:?

WAN Segment:

• You have been given both the network address and subnet mask for this segment. Determine how many possible addresses exist in a network with the subnet mask provided.
• (Hint: the subnet mask in this question produces a VERY SMALL network. Neither of the addresses you use for the interfaces will be anywhere close to 254 or 255). 
• Assign the first available IP address in the first subnet to the interface on the Branch router connected to the WAN link
• Assign the last available IP address in the first subnet to the interface on the HQ router connected to the WAN link
• Determine the prefix based on the given subnet mask of 255.255.255.252

Fill in the appropriate address and prefix information below. The prefix does not need to be the entire network address, but rather just the two-digit number:

Branch WAN interface IP address:_____

HQ WAN interface IP address:___

Prefix (with or without the slash):______

Answer 1

Subnet musk in binary form:

11111111.11111111.11111111.11111100

We have 2 host bits so there are

$2^2-2=2$

addresses exist in a network.

Prefix: 32-2=30

First address: 209.165.165.1

Last address: 209.165.165.2

Answer:

Branch WAN interface IP address: 209.165.165.1

HQ WAN interface IP address: 209.165.165.2

Prefix (with or without the slash): /30