17. You have been tasked with setting up a VoIP system. When connecting a VOIP gateway...

17. You have been tasked with setting up a VoIP system. When connecting a VOIP gateway to a POTS line, which the port used will be used on the gateway? A. FXO B. ENM C. BRI D. FXS 18. Easy question. You look at an IP address. What are the two parts of an IP address? A. Network portion and host portion B. Global portion and local portion C. Network portion and local portion D. Global portion and host portion 19. TCP is not used to transmit voice because what? A. Retransmission of lost data degrades voice quality B. It is slow C. It does not provide guaranteed delivery D. It is connectionless 20. We covered this one in class. Typically, voice is sampled at __________ times per second? A. 8000 B. 500 C. 547 D. 1000 21. In terms of Ethernet, what is the proper name to be used for a protocol data unit? A. Packet B. Datagram C. Frame D. PDU

Expert Solution

17. [A. FXO]

Explanation:- FXO is the foreign exchange office and works as an interface that connects your Plain Old Telephone Service (POTS) line to a VoIP adapter. The FXO is also connected to the FXS port requesting a dial tone to needed to initiate a call.

18. [A. Network portion and host portion]

Explanation:- Since we know an IP address made up of 32 bits. The network part specifies the unique number that is assigned to your network. The network part also identifies the class of network that is assigned. whereas, the host or the node part uniquely identifies this machine on your network.

19. [A. Retransmission of lost data degrades voice quality]

Explanation:- One lost or corrupted packet effectively prohibits the application of receiving any packets which come after it, since TCP preserves the order of the packets. As this protocol heavily relies on the retransmission of the lost data hence, the waiting for retransmitted packets adds extra delay to the communication.

20. [A. 8000]

Explanation:- Usually, voice is sampled at 8000 samples per second. You should be aware that the human hearing operates between 20 Hz and 20 kHz, so the human voice operates well within this extreme.

21. [C. Frame]

Explanation:- A frame is also a unit of data transmission. In computer networking the term is only used in the context of the Data link layer (layer 2). The Ethernet operates on the two layers i.e Physical layer and Data link layer and in the data link layer the Protocol data unit is called as Frames.

venereology answered 1 year ago

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