Click the Exhibit button to view the topology.

Host 1 and Host 2 are on Ethernet LANs in different buildings. A serial line is installed between
two Cisco routers using Cisco HDLC serial line encapsulation. Routers A and B are configured to
route IP traffic. Host 1 sends a packet to Host 2. A line hit on the serial line causes an error in the
packet. When this is detected, the retransmission is sent by:

A.
Host 1

B.
Host2

C.
Router A

D.
RouterB

E.
Protocol analyzer