Transport Layer

The transport layer provides logical communication between:

Which service is NOT provided by either TCP or UDP?

When computing a UDP checksum, the sender adds the 16-bit words and obtains the sum 0100101011000010. What value is placed in the checksum field?

The purpose of the UDP checksum is to:

Why is a sequence number added to packets in rdt2.1?

The main performance problem with rdt3.0 (stop-and-wait) is:

In Go-Back-N, when the sender's single timer expires it:

In TCP, the acknowledgement number field indicates:

TCP fast retransmit is triggered by receiving:

TCP flow control prevents the sender from overflowing the:

Transport protocols run in end systems, not in core routers.

UDP is connectionless and does no handshaking before sending data.

If the UDP checksum matches at the receiver, the segment is guaranteed to be error-free.

rdt3.0 adds a timer so the sender can retransmit when a packet or ACK is lost.

Pipelining allows only one unacknowledged packet in flight at a time.

Selective Repeat buffers out-of-order packets and retransmits only the lost one.

TCP delivers a byte stream with explicit message boundaries.

TCP establishes a connection using a three-way handshake (SYN, SYN-ACK, ACK).

Congestion control and flow control are the same thing.

In TCP slow start, cwnd starts at 1 MSS and doubles every RTT.

Match each layer/concept.

Match each protocol with a property.

Match each reliable-transfer mechanism with its purpose.

Match each pipelined protocol behaviour.

Match each TCP control concept.