Udent Name: Student ID: Question 1. Fi 1 18 points]: Circle the correct choice(s

Question

Udent Name: Student ID: Question 1. Fi 1 18 points]: Circle the correct choice(so) for each of the following question ber optic transmission has the following advantage(s) (a) resistance to electromagnetic interference (b) low attenuation / Km (c) high-bandwidth (d) all of above, 16-QAM, the bit rate is the baud rate. (a) equal to (b) twice (c) half (d) four times (e) one fourth () none of the above. 3. In wave propagation, the radio waves follow the curvature of the earth. (a) sky (b) ground (c) line of sight (d) none of the above. . Encryption and decryption of information is done at the layer. (a) physical (b) data link (c) network (d) transport (e) none of the above. 5. Routing of packets in the network is provided by the layer. (a) physical (b) data link (c) network (d) transport (e) none of the above. 6. The layer header includes the port address information for the process (or application). 7. The address uniquely defines a host connected to the Internet. (a) physical (b) logical or IP 8. Infiber(s), the refractive index inside the core is not constant.(a) multimode graded-index (a) physical (b) data link (c) network (d) transport (e) application. (c) port (d) none of the above. (b) multimode step-index (c) single-mode (d) a and b (e) b and c.

Explanation / Answer

1.option A)Resistance to Electromagnetic interference

Becuse in practical cabal deployment,it's inexorable to meet environments like power substations,heating,ventilating and other industrial source of interference.However,fiber has a very low rate of bit error,as a result of fiber being so resistant to electromagnetic interference.fiber optic transmission is virtually noise free.

3.option B)ground

curves are presented for the rapid calculation of the ground wave for radio proppagation over a spherical earth of arbitary ground constants,antenna heights and polarization.

4.option A)physical layer

becase it is responsible for establishing a physical connecion between sender and receiver and also responsible for sending raw bits of data through communication channel between sender and receiver

5.option C)network layer

6. option D)transport layer

this is the layer charged with handling end-to-end communication;be it reliable or unreliable

7.option B)logical or IP

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