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Refer to the exhibit. Two Cisco routers R1 and R2 were connected through their serial interface using a /30 subnet mask. The command "show cdp entry *" was executed to learn information about the WAN neighbor. Which two statements are true about the output? (Choose two)
The router platform of router R1 is 3725.
Router R2s Serial1/0 interface has an IP of 10.10.20.2.
The information was sent thorough Serial 0/1 of router R2.
IP of 10.10.20.2 belongs to router R1s Serial1/0 interface.
The information was learned through Serial 1/0 of router R1.
CDP (Cisco Discovery Protocol) is a layer 2 protocol used to discover information about attached devices. The command "show cdp entry*" displays information about all the Cisco devices attached to the local device. With CDP neighbor information can be obtained, such as neighbor hostname, IP, platform, etc. The interface displayed is where the router learned the information. If the subnet mask is 255.255.255.252 (/30) then only two possible IPs can be used. IP 10.10.20.2 is identifying the interface on router R2 and IP 10.10.20.1 must be on the other end (R1). For more information refer to: http://www.cisco.com/c/en/us/support/docs/network-management/discovery-protocol-cdp/43485-cdponios43485.html
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