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2. Describe connection-oriented network service and connectionless network service, and identify the key differences between them.

1. What is the port number for TCP?
   A. 6, B. 17, C. 53, D. 69, E. 80

2. What is the port number for UDP?
   A. 6, B. 17, C. 21, D. 23, E. 25

3. Which are true statements about connection-oriented sessions?
   A. The segments delivered are acknowledged back to the sender upon their reception.
   B. Any segments not acknowledged are dropped.
   C. Segments are sequenced back into their proper order upon arrival at their destination.
   D. A manageable data flow is maintained in order to avoid congestion, overloading, and the loss of any data.
   E. Any segments not acknowledged are retransmitted.

4. UDP works at which layer of the DOD model?
   A. Network, B. Transport, C. Internet, D. Host-to-Host, E. Data Link

5. Which port numbers are used by TCP and UDP to set up sessions with other hosts?
   A. 6 and 17 respectively
   B. 1-255
   C. 256-1022
   D. 1023 and above
   E. B & C

6. What is the difference between TCP and UDP?
   A. TCP is connection-orientated; UDP uses acknowledgements only.
   B. TCP & UDP are connection-oriented, only TCP uses windowing.
   C. TCP is sequenced, but UDP is unsequenced.
   D. TCP is connectionless, but UDP is connection-oriented.
   E. TCP & UDP both have sequencing, but UDP is connectionless.

7. Connectionless protocol (CATAList)

8. Connection-oriented protocol (CATAList)
   A-ATM; B-IP; C-IPX; D-SPX; E-TCP; F-UDP

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