Network Fundamentals 2024 Practice Questions with Correct Answers.docx

Network Fundamentals 2024 Practice Questions with Correct A consists of two copper conductors, but the two conductors are concentric rather than parallel. With this construction and special insulation and shielding, this cable can achieve high data transmission rates. - Answer-Coaxial Cable is the least expensive and most commonly used guided transmission medium. For over a hundred years, it has been used by telephone networks. In fact, more than 99 percent of the wired connections from the telephone handset to the local telephone switch use this type of wire. - Answer-Twisted Pair Copper Wire Twisted-pair copper wire is no longer present in computer networks. (T/F) - Answer- False Before sending a packet into a datagram network, the source must determine all of the links that packet will traverse between source and destination. (T/F) - Answer-False A circuit-switched network can guarantee a certain amount of end-to-end bandwidth for the duration of a call. Most packet-switched networks today (including the Internet) cannot make any end-to-end guarantees for bandwidth. (T/F) - Answer-True The time required to examine the packet's header and determine where to direct the packet is part of the . - Answer-Processing delay is the amount of time required to push all of the packet's bits into the link. - Answer-Transmission delay The length of the queueing delay of a specific packet will depend on the number of earlier-arriving packets that are queued and waiting for transmission onto the link. (T/F) - Answer-True Queueing delay depends on packet length. (T/F) - Answer-False Queueing delay is fixed for a router(T/F) - Answer-False Generally, how long does it take a packet of length L to propagate over a link of distance d, propagation speed s, and transmission rate R bps? - Answer-d/s Generally, how long does it take to transmit a packet of length L over a link of distance d, propogations speed s, and transmission rate R bps? - Answer-L/R Suppose there are one router and two links between a source and a destination. The first link has transmission rate 100 Mbps and the second link has transmission rate of 10 Mbps. Assuming that the only traffic in the network comes from the source, what is the throughput for a large file transfer? - Answer-10 Mbps Message, segment, datagram, frame - Answer-application layer, transport layer, network layer, link layer Layers four and five of the Internet protocol stack are implemented in the end systems but not in the routers in the network core. t f - Answer-True TCP and UDP are located at which layer of the Internet protocol stack? - Answer- Transport Layer FTP is located at which layer of the Internet protocol stack? - Answer-Application layer HTTP is located at which layer of the Internet protocol stack? - Answer-Application layer Ethernet is located at which layer of the Internet protocol stack? - Answer-Link Layer WiFi is located at which layer of the Internet protocol stack? - Answer-Link layer Which protocol provides flow control (sender/receiver speed matching)? - Answer-TCP provides a congestion-control mechanism, so that a source throttles its transmission rate when the network is congested. - Answer-TCP The protocol provides a connectionless service to its applications. This is a no- frills service that provides no reliability, no flow control, and no congestion control. - Answer-UDP Link-layer switches forwards the packets by using packets' IP addresses. t f - Answer- False Process sends/receives messages to/from its . It is analogous to door; sending process shoves message out door. Sending process relies on transport infrastructure on other side of door to deliver message to at receiving process. (Note: These blanks are the same word). Type this word in all lowercase letters. - Answer- socket The application developer has control of everything on the application-layer side of the socket but has no control on the transport-layer side of the socket. t f - Answer-False In addition to knowing the address of the host to which a message is destined, the sending process must also identify the receiving process ( more specifically, the receiving socket) running in the host. This information is needed because in general a host could be running many network applications. A destination number serves this purpose. - Answer-port The transfer of an html file from one host to another is... - Answer-loss-intolerant and time insensitive After the handshaking phase, connection is said to exist between the sockets of the two processes. - Answer-TCP Suppose you wanted to do a transaction from a remote client to a server as fast as possible. Would you use UDP or TCP? - Answer-UDP Indicate whether TCP or UDP (or both or neither) provide the following service to applications. Reliable data transfer between processes. - Answer-TCP only Indicate whether TCP or UDP (or both or neither) provide the following service to applications: Minimum data transmission rate between processes. - Answer-Neither Indicate whether TCP or UDP (or both or neither) provide the following service to applications: Congestion-controlled data transfer between processes. - Answer-TCP only Indicate whether TCP or UDP (or both or neither) provide the following service to applications: Guaranteed in-order delivery of data to the receiver. - Answer-TCP only Indicate whether TCP or UDP (or both or neither) provide the following service to applications: A guarantee that data will be delivered within a specified amount of time - Answer-Neither With non-persistent connections between browser and origin server, it is possible for a single TCP segment to carry two distinct HTTP request messages. t f - Answer-False Suppose your browser wants to download a html page with 10 embedded images (with file names , , ... ). The page and the 10 images are stored on the same server. Assume persistent HTTP (HTTP1.1) and no pipelining (no parallel TC P connections). How many HTTP GET requests will be sent to server? - Answer-11 Suppose your browser wants to download a html page with 10 embedded images (with file names , , ... ). The page and the 10 images are stored on the same server. Assume non-persistent HTTP but assume that the browser can open as many parallel TC P connections to the server as it wants. How many HTTP GET requests will be sent to server? - Answer-11 In a client-server interaction, if all of the requests and their corresponding responses are sent over the same TCP connection, then the application is said to use connections. - Answer-persistent With FTP, the control connection remains open throughout the duration of the user session, but a new data connection is created for each file transferred within a session (that is, the data connections are non persistent). t f - Answer-True SMTP is used to... - Answer-transfer messages from one mail server to another. It is possible for a mail client to send e-mail messages over HTTP rather than SMTP. t f - Answer-True