I will give answer for all questions .
1.Two peer hosts are running applications that exchange data using UDP. During the current session, a datagram fails to arrive at the destination. What is true?
concerning the retransmission of the datagram.
Answer1.Datagram retransmission occurs when the retransmission timer expires in the destination host.
2.network administrator is placing an older router back in to service. The administrator discovered that the IOS and configuration files need to be updated
to meet the LAN specifications. Which application layer protocol is used to transfer the new configuration files into the router memory?
3.Which of the following subnet masks could be used when subnetting a Class B IP address? (Choose two.)
Answer126.96.36.199.0 ,255.255.255.128 (Its talking about Subnetting with Class
4.Which of the following describe the token-passing logical topology? (Choose two.)
Answer4.Token-passing logical topologies must also be physical ring topologies.
Computers are allowed to transmit data only when they possess a token.
5.How will the MAIN router dynamically learn a route to the 10.16.10.48/28 subnetwork in the diagram
Answer5.with a routing protocol (like RIP,IGRP,OSPF,EIGRP)