Computer Networks Question Answers Objective (MCQ)  Question 1 A group of computers and other devices connected together is called ……………. A Network B Networking C Intranet D both b and c Question 2 Which of the following network is used to connect a number of computers to each other by cables in a single location? A WAN B LAN C MAN D both b and c Question 3 Transmission Lines are also called as…………………. A circuits B channels C trunks D circuits channels, or trunks Question 4 The Switching Elements are also called as ………. A host B subnet C Interface Message Processors (IMPs) D both a and b Question 5 The signal which has infinitely many levels of intensity over a period of time is called ……… A digital signal B analog signal C both a and b D sound signal Question 6 The absolute value of a signal's highest intensity is called………. A Peak Amplitude B Frequency C Phase D Both a and c Question 7 The distance a simple signal can travel in one period is called ………… A Wavelength B propagation speed C Frequency D both a and b Question 8 A noise where foreign signal enters the path of the transmitted signal is called …… A Impulse B Inter modulation C cross talk D both b and c Question 9 Which type of channel it is where the number of users are stable and the traffic is not bursts? A static channel B dynamic channel C free channel D both a and c Question 10 With Slotted Aloha, a …………. sends out small clock tick packets to the outlying stations. A distributed clock B synchronized clock C centralized clock D Digital clock Question 11 If there is only one station with a packet to send, this guarantees that there will ………….. For that packet. A never be a collision B be a collision C be an improvement D direction Question 12 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 Question 13 ________ is the process in which the receiver tries to guess the message by using redundant bits A Connection-Oriented Service B Forward error correction C both a and b D Confirm Question 14 In ______ type of service, no connection is established before hand or afterwards. A Unacknowledged Connectionless Service B acknowledged Connectionless Service C point to point D both a and b Question 15 The range of sequence number which is the concern of the receiver is called the receive sliding window. A receive sliding window. B sliding window C frame buffer D both a and b Question 16 Data Link Control Protocol (HDLC) is implemented at the ……… A Data link layer B Network layer C transport layer D Physical layer Question 17 The maximum size of the window in a Sliding Window Protocol is _______ A 2m – 1 B 2m + 1 C 2m D 2m-1 Question 18 The _______ layer is the topmost layer in the subnet. A Network B application C transport D physical Question 19 The subnet gets increasingly loaded with packets causing increase in delay in the delivery of packets, which can lead to more retransmission, and ultimately increasing more and more traffic. This is a concept called as _________ A blockage B Traffic jam. C Congestion D both a and b Question 20 ______ is a static algorithm in which every incoming packet is sent out on every outgoing line except the one it arrives on. This method usually generates vast number of duplicate packets.. A Flooding B Wait and watch C congestion D both a and c Question 21 The Internet addresses are ______ bits in length in IPV4 addressing scheme A 16 B 64 C 32 D 48 Question 22 In addresses for _______ networks, the first 16 bits specify a particular network, and the last 16 bits specify a particular host. A class A B class C C class B D class D Question 23 The number of network segments on which the datagram is allowed to travel before a router should discard it is called _______. A Time to Live (TTL) B Time to Die(TTD) C self recognition D both a and b Question 24 An application process is assigned a process identifier number (process ID), which is likely to be _______ each time that process is started. A Similar B smaller C different D larger Question 25 A ________ is a 16-bit number used by the host-to-host protocol to identify to which higher-level protocol or application program (process) it must deliver incoming messages A connection B UDP C port D TCP Question 26 A UDP datagram of _____ bytes is acceptable to all implementations A 516 B 1024 C 256 D 512 Question 27 The service access points in Session Layer are called ________________ A Accessing point B activation point C Session Service Access Points D both a and b Question 28 Sessions are ended with ________ primitive A B-RELEASE. Request B R-RELEASE. request C S-RELEASE. request D A-RELEASE. request Question 29 A procedure included in the caller’s address space by the linker is known as ______. A local procedure B Universal procedure C addressing linker D both a and b Question 30 The ______ protocol is based on end-to-end delivery. A SCTP B TCP C SMTP D SCTP Question 31 The sender SMTP establishes a TCP connection with the destination SMTP and then waits for the server to send a ____ Service ready message.. A 420 B 320 C 220 D 120 Question 32 There is _____ number of standard content types in MIME A 7 B 5 C 9 D 4 Question 33 To avoid ambiguity, the names assigned to machines must be carefully selected from a ______ with complete control over the binding between the names and IP addresses A Table B look up table C name space D name table Question 34 A name in the _______ name space is a sequence of characters without structure A address B Doman C Flat D Both a and b Question 35 The ____ namespace is based on a hierarchical and logical tree structure A DNS B Address C table D both a and b Question 36 The ______ are programs that run on DNS clients and DNS servers and that create queries to extract information from name servers. A transporter B distributers C Resolvers D both a and b Question 37 The next header t is an _____ field of Authentication Header that identifies the type of what follows. A 16-bit B 64-bit C 8-bit D 32-bit Question 38 The client code recognizes the SSL request and establishes a connection through TCP port ____ to the SSL code on the server A 1023 B 402 C 443 D 8080 Question 39 A _____ should be considered as a means to divide the world into two or more networks: one or more secure networks and one or more non-secure networks. A firewall B ESP C SSL D both a and b Question 40 The _______ is used to provide integrity check, authentication, and encryption to IP datagram’s. A UDP B Transport layer C ESP D SSL Question 41 In most Wide Area Networks, the subnet consists of two distinct components: which are they? A Transmission Lines and Switching Elements. B host and subnet C Transmission Lines and host D subnet and Switching Elements. Question 42 There are two types of designs for communication subnets: they are ………….. A Point-to-Point channels and Broadcast channels B packet-switched subnet and store-and-forward C Multicasting and Broadcasting D Point-to-Point channels and store-and-forward Question 43 The main hardware components of a graphics workstation are …………….. A Thick coax, optical fiber B twisted pair , thin coax C twisted, optical fiber D Thick coax, Thin coax Question 44 S/NET is another kind of ………….network with an ………….for switching. A fiber optic, active star B active star , fiber optic C twisted cable, active network D active network, twisted cable Question 45 The Aloha protocol is an OSI _______ protocol for LAN networks with broadcast topology A layer 1 B layer 4 C layer 2 D layer 3 Question 46 Thus hamming code for the ASCII character “a” is given as ……………… A 10111001111 B 10111001000 C 10111001001 D 10111001 Question 47 Coding schemes can be divided into two broad categories…………, …………….. A character coding, integer coding B hamming coding and block coding C Hamming coding and convolution coding D Block Coding and Convolution Coding. Question 48 The IP Control Protocol (IPCP) is the NCP for IP and is responsible for ………., …………., and disabling the IP protocol on both ends of the point-to-point link. A Reframing , enabling B Deleting, reframing C configuring, enabling, D configuring, reframing Question 49 The _______ is a unidirectional protocol that has no flow or error control. A Simplest B Simplex C TCP/IP protocol D Simplest or Simplex Question 50 Flooding is also a……... algorithm, usually generates ………... of duplicate packets. A Static, vast number B dynamic , vast number C Static, less number D dynamic , less number Question 51 Distance Vector Routing is a……... routing algorithm, it consists of a data structure called a ……… A Static , routing table B Dynamic, look-up table C Dynamic, routing table D Static, look-up table Question 52 Each IP address can identify the ………... or ………... of IP packets. A source, destination B length, size C source, length D Size , destination Question 53 In process to process delivery, an application process is assigned a ………….., which is likely to be …………….each time that process is started A process identifier number , different B process identifier number, same C source, mixed D Source, similar Question 54 The Intel format is called ………... and the SPARC format is called …………….. A little endian, big endian, B big endian, little endian C open source, little endian D Big endian, open source Question 55 The Post Office Protocol is an ………... protocol with both client (sender/receiver) and …………...functions A electronic mail, server (storage) B three layer , server C UDP, transfer D TCP, server Question 56 A zone is a contiguous portion of a ………….. of the DNS namespace whose database records exist and are managed in a……….. DNS database file. A domain, particular B Class, particular C tree, local D Domain, every Question 57 The DNS server that received the initial ……... query checks it’s ………… is called…………... A Recursive, zones B simple, zones C simple, class D Recursive, class Question 58 The purpose of a proxy server is to control exchange of data between the two networks at …………..instead of ……….. A an application level , an IP level B network layer, physical layer C an application layer, physical layer D Network layer , an application layer Question 59 PGP is one of the protocols used to provide security at the ……….. It is designed to create authenticated and confidential ………. A application layer, e-mails. B Network layer, packets C application layer, packets D network layer , e-mails Question 60 State weather the following statement is true or false for Internetwork layer. 1).Other internetwork-layer protocols are IP, ICMP, IGMP, ARP, and RARP. 2). Internet Protocol (IP) is the least important protocol in this layer 3). The internetwork layer, also called the internet layer or the network layer, provides the “virtual network” A 1. True, 2. true, 3. true B 1. true, 2. false, 3.true C 1. false, 2. false, 3. false D 1. true, 2. true, 3. false Question 61 State weather the following statement is true or false for ISDN – Integrated Services Digital NetworkISDN is an effort to standardize subscriber services, provide user/network interfaces 2). the goal of ISDN is to form a Local area network that provides Peer-to-Peer connectivity over digital media 3). It is a set of protocols that combines digital telephony and data transport services A 1. True, 2. false, 3. true B 1. true, 2. false, 3. false C 1. false, 2. false, 3. false D 1. true, 2. true, 3. false Question 62 State weather the following statement is true or false for Token Bus 1).It is a linear or tree-shaped cable onto which the stations are attached. 2). the token propagates around the logical ring, with only the token holder being permitted to transmit frames 3). In this token bus arrangement The physical order in which the stations are connected to the cable is very important. A 1. False, 2. true, 3. true B 1. true, 2. false, 3. false C 1. false, 2. false, 3. false D 1. true, 2. true, 3. false Question 63 Find the transmitted code if the frame is (MSB) 1101011011 (LSB) and generator polynomial is x4 + x + 1. A 1101011011 1110 B 1101011111 1110 C 1101011011 1111 D 1101011011 Question 64 State weather the following statement is true or false for Point-to-Point Protocol 1). It is still in widespread use for dial-up TCP/IP connections 2) Point-to-point circuits in the form of asynchronous lines have long been the mainstay for data communications. 3). Point-to-Point Protocol (PPP) is a network-specific standard protocol with STD number 51. A 1. True, 2. true, 3. true B 1. true, 2. false, 3. false C 1. false, 2. false, 3. false D 1. true, 2. false, 3. true Question 65 State weather the following statement is true or false for Hierarchical Routing 1). In hierarchical routing, the routers are divided into regions. 2) Each router is having the idea about internal structure of other regions 3). Two level hierarchies may be insufficient hence it may be necessary to group the regions into clusters. A 1. True, 2. true, 3. true B 1. true, 2. false, 3. false C 1. false, 2. false, 3. false D 1. true, 2. false, 3. true Question 66 State weather the following statement is true or false for IPV6 Addressing 1). IPV6 is a routable protocol that addresses, routes, fragments, and reassembles packets 2).IPV6 is a connectionless, unreliable datagram protocol. 3). An IPV6 packet consists of an IPV6 header and an IPV6 payload. A 1. True, 2. true, 3. true B 1. true, 2. false, 3. false C 1. false, 2. false, 3. false D 1.false, 2. true, 3. true Question 67 State weather the following statement is true or false for Stream Control Transmission Protocol (SCTP). 1). SCTP uses only few known ports in the TCP space. 2).SCTP is a new transport protocol at the same layer as TCP and UDP. 3). SCTP is a new reliable, message oriented transport layer protocol. A 1. True, 2. true, 3. true B 1. true, 2. false, 3. false C 1. false, 2. false, 3. false D 1.false, 2. true, 3. true Question 68 State weather the following statement is true or false for Exception Reporting 1). If the user runs into trouble, this trouble can be reported to the peer using a S-U-EXCEPTION-REPORT. request primitive. 2). Exception reporting does not only apply to user-detected errors 3). The service provider can generate an S-P-EXCEPTION-REPORT.indication to notify the user about internal problems within the session layer. A 1. True, 2. true, 3. true B 1. true, 2. false, 3. false C 1. false, 2. false, 3. false D 1.false, 2. true, 3. true Question 69 State weather the following statement is true or false for Multipurpose Internet Mail Extensions 1).The general syntax for MIME header fields is not the same as that for RFC 2822. 2).MIME header field names are never significant, but the cases of field values can b. 3). A MIME-compliant message must contain a header field with the following verbatim text: MIME-Version: 1.0 A 1. True, 2. true, 3. true B 1. true, 2. false, 3. false C 1. false, 2. false, 3. false D 1.false, 2. true, 3. true Question 70 State weather the following statement is true or false for Sendmail. 1).Sendmail is a command-line tool designed for most UNIX-like operating systems. 2).It define a method of transferring mail, and acts as a client/server that supports multiple mail protocols 3). Sendmail exists in both open source and proprietary software packages. A 1. True, 2. False, 3. true B 1. true, 2. false, 3. false C 1. false, 2. false, 3. false D

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