Module-5 Quiz Preparation

Suppose an application generates chunks of 60 bytes of data every second, and each chunk gets encapsulated in a TCP segment and then an IP datagram. What percentage of each datagram will contain application data.

• 20%

• 40%

• 60%

• 80%

Consider sending a 1300 byte datagram into a link that has an MTU of 500 bytes.

• Three fragments are created, with offsets 0, 460 and 920.

• Three fragments are created with offsets 0, 480 and 960.

• Three fragments are created with offsets 0, 500 1000

• None of the above

In a router, queuing can occur

• in the input ports

• in the output ports

• in an interconnection network

• all of the above

In a high-performance router, shadow copies of the routing table are kept in

• the input ports

• the output ports

• the switching fabric

• all of the above

Suppose a router has n input ports each with identical line speeds, n output ports each with identical line speeds, and the line speed of an output port is at least n times as that of an input port. Further suppose that the switching fabric speed is at least n times as fast as an input line speed. Then

• queuing can occur in an input port

• queuing can occur in the switching fabric

• queuing can occur in an output port

• there is no queuing delay in the router

Suppose one IPv6 router wants to send a datagram to another IPv6 router, but are connected together by intervening IPv4 routers. If the two routers use tunneling, then

• The sending IPv6 router creates an IPv4 datagram and puts it in the data field of an Ipv6 datagram.

• The sending IPv6 router creates an IPv6 datagram and puts it in the data filed of an IPv4 datagram.

• The sending IPv6 router one or more IPv6 fragments, none of which is larger than the maximum size of an IPv4 datagram.

• None of the above

With a datagram network layer, each packet carries the address of the destination host.

• True

• False

Suppose the computer in your office has been configured with an IP address, and you move (along with your computer) to an office down the hall. If after the move your computer is connected to the same IP network, then it is not necessary to reconfigure the IP address in your computer.

• True

• False

The network portion of an IP address is the same for all the hosts on the same IP network.

• True

• False

A gateway router must run both an intra-AS routing algorithm and an inter-AS routing algorithm.

• True

• False