• North Carolina State University

• ECE 407

ECE 407 Computer networking

Midterm Exam

Time: 75 minutes

Note: Please clearly mark your answer, unrecognizable writing will not receive points.

For calculation questions, you need to show all necessary calculation steps to receive full points.

Part I (10 x 2 points = 20 points total)

1. (2 pts) ___C_ which in the following is NOT true about the packet switch (PS) and the circuit

switch (CS).

a. PS can accommodate more users than CS.

b. Users of CS can expect uninterrupted service, while users of PS may experience service

interruption.

c. PS can transmit data faster than CS.

d. FDM and TDM are two techniques used for CS.

2. (2 pts) __D__ which in the following is not considered an example of Access Network?

a. The WiFi network used in a house.

b. The 4G network used by AT&T.

c. The coaxial cable connected to a residential building.

d. The high-speed network deployed between AT&T and Verizon for exchange data.

3. (2 pts) _B___ which in the following does not belong to the TCP/IP 5 layer model?

a. Transport layer

b. Presentation layer

c. Link layer

d. Application layer

4. (2 pts) ___B,D_ choose the protocol(s) that does not belong to the application layer. There may

be one or more correct answers.

a. HTTP

b. TCP

c. IMAP

d. IP

5. (2 pts) Which of the following statements is true regarding UDP (User Datagram Protocol)?- C

a. It ensures reliable delivery of packets

b. It guarantees in-order delivery of packets

c. It is connectionless and does not guarantee reliable delivery

d. It uses a three-way handshake to establish a connection

6. (2 pts) A graphical HTML browser resident at a network client machine Q accesses a

static HTML webpage from a HTTP server S. The static HTML page has exactly one

static embedded image which is also at S. Assuming no caching, which one of the

following is correct about the HTML webpage loading (including the embedded image)?