14.7 UDP Communication

Why is UDP desirable for protocols that make a simple request and reply transactions? - Flow Control - Low overhead - Reliability - Same-order delivery

- Low overhead

Which of the following would be valid source and destination ports for a host connecting to a DNS server? - Source: 53, Destination: 49152 - Source: 1812, Destination: 49152 - Source: 49152, Destination: 53 - Source: 49152, Destination: 1812

- Source: 49152, Destination: 53

Which UDP datagram reassembly statement is true? - UDP does not reassemble the data. - UDP reassembles the data in the order that it was received. - UDP reassembles the data using control bits. - UDP reassembles the data using sequence numbers.

- UDP reassembles the data in the order that it was received.

UDP [DOES / DOES NOT] track sequence numbers the way TCP does. UDP has [A / NO] way to reorder the datagrams into their transmission order, as shown in the figure. Therefore, UDP simply reassembles the data in the order that it was received and forwards it to the application. If the data sequence is important to the application, the application must identify the proper sequence and determine how the data should be processed.

DOES NOT NO

UDP [DOES / DOES NOT] establish a connection. UDP provides _____ overhead data transport because it has a _____ datagram header and [A / NO) network management traffic.

DOES NOT low small NO

Remote Authentication Dial-in User Service (RADIUS)

The Remote Authentication Dial-in User Service (RADIUS) server shown in the figure provides authentication, authorization, and accounting services to manage user access.