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1) In a/an ........... of DNS resolver, instead of supplying a name and asking for an IP address, the DNS client provides the IP address and requests the corresponding host name. A. Recursive queries B. Iterative queries C. Reverse queries D. Inverse queries 2) For each resolved query, the DNS resolver caches the returned information for a time that is specified in each resource record in the DNS response. This is known as ......... A. Positive caching B. Time To Live C. Negative Caching D. Reverse Caching 3) As originally defined in RFC 1134, .............. negative caching is the caching of failed name resolutions. A. Positive caching B. Time To Live C. Negative Caching D. Round Robin Load Balancing 4) ............... can reduce response times for names that DNS cannot resolve for both the DNS client and DNS servers during an iterative query process. A. Positive caching B. Time To Live C. Negative Caching D. Round Robin Load Balancing 5) The amount of time in seconds to cache the rec...

1) In MIME header field, ............. is a world unique value identifying the content of this part of this message. A. content-type B. content-transfer-encoding C. content-description D. content-id 2) The Post Office Protocol, version 3, is a standard protocol with STD number 53 and it is described in ..... A. RFC 1939 B. RFC 0937 C. RFC 2821 D. RFC 2822 3) .............. is an electronic mail protocol with both client and server functions. A. SMTP B. MIME C. POP D. TCP 4) In authentication state of POP3 server, ............ is used to specify a mechanism by which both authentication and data protection can be provided. A. USER B. PASS C. APOP D. AUTH 5) In transaction state of POP3 commands, .......... retrieve the number of messages and total size of the messages. A. STAT B. LIST C. RETR D. DELE 6) A MIME compliant message must contain a header field with the ........ verbatim text. A. MIME-version:1.0 B. MIME-version:1.1 C. MIME-version:2.0 D. MIME-version:2.1 7) In ......... name ...

1) Which of the following is/are the important applications of application layer? A. Electronic mail B. World Wide Web C. USENET D. All of the above 2) The TCP/IP ............. corresponds to the combined session, presentation, and application layers of the OSI model. A. session layer B. presentation layer C. application layer D. None of the above 3) The .......... protocol is based on end-to-end delivery. A. SMTP B. TCP C. IP D. SCTP 4) The well-known port of SMTP server is ........ A. 110 B. 25 C. 50 D. 20 5) In SMTP header field, ............. is a summary of the message being sent which is specified by the sender. A. Reply-to B. Return-path C. Subject D. From 6) In SMTP herder field, .......... is added by the final transport system that deilvers the mail. A. Reply-to B. Return-path C. Subject D. From 7) In SMTP mail transaction flow, the sender SMTP establishes a TCP connection with the destination SMTP and then waits for the server to send a .......... A. 220 service ready messag...

                     1) The .......... is responsible for end to end delivery, segmentation and concatenation. A. Physical layer B. Data Link layer C. Network layer D. Transport layer 2) .......... needs ports or service access points. A. Physical layer B. Data Link layer C. Network layer D. Transport layer 3) The task of ............... is to provide reliable, cost effective transport of data from source machine to destination machine. A. Network Layer B. Transport Layer C. Presentation Layer D. Application Layer 4) The hardware and/or software within the transport layer which does the work of making use of the services provided by the network layer is called as ......... A. transport media B. transport device C. transport entity D. network transporter 5) .......... measures the number of bytes of user data transferred per second, measured over some time interval. It is measured separat...

1) The ......... provides two well-defined classes of services, namely connectionless and connection oriented services to the numerous nodes or hosts communicating through subnet. A. physical layer B. data link layer C. network layer D. transport layer 2) In computer networking the term .......... refers to selecting paths in a computer network along which to send data. A. routing B. inter-networking C. internal organization D. congestion control 3) ............ Routing algorithms do not base their routing decisions on measurements or estimates of the current traffic and topology. A. Static or Non-adaptive B. Static or adaptive C. Dynamic or Non-adaptive D. Dynamic or adaptive 4) ............. Routing algorithm in contrast change their routing decisions to reflect changes in topology and usually the traffic as well. A. Static or Non-adaptive B. Static or adaptive C. Dynamic or Non-adaptive D. Dynamic or adaptive 5) ........... is also a static algorithm in which every incoming packet ...

1) The .......... layer provides a well defined service interface to the network layer, determining how the bits of the physical layer are grouped into frames. A. Data Link B. Physical C. Network D. Session 2) The service primitives provide a way for the data link layer on the requesting side to learn whether the request was successfully carried out. A. Request B. Indication C. Response D. Confirm 3) The different types of services provided by data link layer is/are ... A. Unacknowledged connectionless service B. Acknowledged connectionless service C. Acknowledged connection oriented service D. All of the above. 4) .......... is used by the network layer to ask the data link layer to do something. A. Request B. Indication C. Response D. Confirm 5) In ............... the source machine sends independent frames to the destination machine without having the destination machine acknowledge them. A. Unacknowledged connectionless service B. Acknowledged connectionless service C. Acknowledged...

1) Which of the following is/are the applications of twisted pair cables ...... A. In the local loop B. In the DSL line C. In the ISDN Network D. All of the above 2) .......... transmission systems are widely used in the backbone of networks. A. Unshielded Twisted Pair(UTP) B. Shielded Twisted Pair(STP) C. Optical Fiber D. Wireless 3) ........... has much lower attenuation and can carry signal to longer distances without using amplifiers and repeaters in between. A. UTP cable B. STP cable C. Fiber Optic cable D. All of the above 4) The major problem(s) suffered for transmission lines on physical layer is/are ......... A. Attenuation distortion B. Delay distortion C. Noise D. All of the above 5) ......... is the lost of energy as the signal propagates outward. A. Attenuation distortion B. Delay distortion C. Noise D. None of the above 6) .......... is the unwanted energy from sources other than the transmitter. A. Attenuation distortion B. Delay distortion C. Noise D. Disturbance 7) Whi...

1. The ........ layer links the network support layers and the user support layers. A. transport B. network C. data link D. session 2) The ............. layer changes bits into electromagnetic signals. A. physical B. data link C. transport D. network 3) The .......... layer coordinates the functions required to transmit a bit stream over a physical medium. A. transport B. network C. data link D. physical 4) Which of the following is an application layer service? A. remote log-in. B. file transfer and access. C. mail service D. all of the above 5) The ......... layer is responsible for the source-to-destination delivery of a packet across multiple network links. A. transport B. network C. data link D. session 6) The .......... layer is the layer closest to the transmission medium. A. physical B. data link C. network D. transport 7) The ...........layer is responsible for the process-to-process delivery of th entire message. A. transport B. network C. data link D. physical 8) Mail servic...