(单选题)There are two fundamental approaches to building a network core, ( ) and packet switching.

(单选题)In the following applications, which one uses UDP? ( )

(单选题)DNS means ( ).

(单选题)A transport-layer protocol provides for logical communication between ( ).

(单选题)Services provided by transport layer include ( ).

(单选题)UDP is a ( )service while TCP is a connection-oriented service.

(单选题)The UDP header has only four fields, they are( ).

(单选题)TCP service does not provide( ).

(单选题)The host that initiates the session in the Internet is labeled as ( ).

(单选题)A ( )layer protocol provides for logical communication between applications.

(单选题)The receive side of transport layer reassembles segments into messages, passes to ( ) layer.

(单选题)The port number used by HTTP is( ).

(单选题)The UDP header has only ( ) fields.

(单选题)TCP ( ) means sender won’t overflow receiver’s buffer by transmitting too much, too fast.

(单选题)Which service does UDP not provide? ( )