Computer Science Questions
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A TCP machine is sending full windows of 65,535 bytes over a 1-Gbps channel that has a 4-msec one-way delay. What is the line effciency?A. 2.6%B. 13.1%C. 0.8%D. 6.5%
What does NAT stand for?A. Network Address TranslationB. Network Address TableC. Network Address TransferD. Network Address Taking
Which of the following statement is correct?A. Half-Duplex: Communcations that can go only one directionB. Full-Duplex: Communcations that can go only one directionC. Half-Duplex: Communcations in which both sender and receiver can send at the same timeD. Full-Duplex: Communcations in which both sender and receiver can send at the same time
In the ________ encoding scheme. 24 bits become 4 chatecters, and eventually anre sent as 32 bits.A. binaryB. 8bitC. none is correctD. base64
Jitter is introduced in real-time data by the _______________.A. both (error caused during transmission) and (Difference of the delay among packets)B. Difference of the delay among packetsC. none is correctD. error caused during transmission
What is the combination of an IP address and a port number called?A. checksumB. A sequence number C. A socketD. A data offset
NAT used at the router toA. Translate the IP address to MAC addressB. All of themC. Translate the port number of the host in the subnet side to port number outside the subnetD. Traslate the IP address of hosts in the subnet to the IP address outside the subnet
How many collision domains has the computer network with 88 computers, 10 hubs, and 2 repeaters? A. 12B. 1 C. 100D. 10
In the DNS, the names are defined in _________ structureA. a linear listB. an inverted-treeC. none is correctD. a graph
The second phase of JPEG is _______A. data compressionB. quantizationC. none is correct D. DCT transformation
In Datagram networks and in Virtual-Circuit networks:A. All are correct B. All packets follow one unique path for the same source-destination pairC. One has all packet to route in one path; One has each packet to route independentlyD. One has each packet to route independently; One has all packet to route in one path
Which ones are correct about Layer 2 Switch?A. None are correct B. It can know the socket numberC. Both of themD. It can know the IP addresses
What are general functions of router?A. Determine the next node to receive the messageB. All are correctC. Store and forward packetsD. Find path for packets and transfer them
The purpose of MTA (Mail Tranfer Agent) isA. Transferal of message across the InternetB. Envelope creationC. Message preparationD. Message preparation and Envelope creation
The local host and the remote host are defined using IP addresses. To define the processes we need second identifers calledA. Transport numberB. none of themC. UDP addressesD. Port number
The advantage of UDP isA. Providing congestion controlB. Providing reliable communication C. None is correct D. Faster than the TCP
In the OSI Model, which of the following functions are performed at the Application Layer?A. mail service B. all are correct C. file transfer, access, and management D. network virtual terminal
Maixmum number of data flow through in N-port switchA. N-1 B. N/4C. N/2 D. N
In _______ resolution, the resolver expects the server to supply the final answerA. none is correct B. iterativeC. stratight D. recursive
Urgent data requires the urgent pointer field as well as the URG bit in the _______ field.A. sequence numberB. control C. offsetD. none is correct