Computer Networks Interview Questions

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    What is subnetting? why is it used?

    Ashfaq

    • Apr 12th, 2018

    Sub netting means dividing the large SINGLE network into many small networks . the main REASON to divide like this ..is to REDUCE or PROHIBIT DATA TRAFFIC during transfer.

    usama jamil

    • Aug 10th, 2016

    Subneting is used for dividing bigger networks into smaller chunks. Performance is improved and security is improved. Minimum loss of IP addresses.

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    What is the difference between physical address and logical address?

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    Answered by: kalyan raghavan

    • Jan 23rd, 2006


    A Physical address is a 48-bit flat address burned into the ROM of the NIC card which is a Layer1 device of the OSI model. This iis divided into 24-bit vendor code and 24-bit serial address. This is unique for each system and cannot be changed.

    A Logical address is a 32- bit address assigned to each system in a network. This works in Layer-3 of OSI Model. This would be generally the IP address.

    Manu Ratheesh

    • Aug 26th, 2017

    Physical Address: It is the address of a node defined by its LAN or WAN. It is included in the frame used by Data Link Layer. It is the lowest level address. The size and the format of these addresses...

    paras gautam

    • Aug 19th, 2017

    A logical address is a 32 bit address which is also called ip address and it is used to uniquely identify a device on a network where physical address is also Media Access Control address it is 48 bit address every device in a network has its own unique MAC address

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    What is the difference between domain & workgroup?

    Mangesh

    • May 24th, 2017

    Workgroup.
    Every PC responsible for its own security

    Domain.
    Centralized administrator
    Service?is responsible?for security

    Ricky

    • Mar 1st, 2017

    Workgroup: (i) Every PC is responsible for its security own. (ii) No centralize administration (iii) Main aim to save hardware recourse (iv) Best suite in school, training institute, cyber cafe Do...

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    Use Only mac address to communicate.

    Can we communicate by using only the MAC address in Same network?

    Aks

    • Oct 29th, 2016

    Every system in network is identified by unique IP address. Therefore I think IP address is essential for communication. Mac address is the machine address. But in network this address is unknown to a...

    David

    • Aug 11th, 2016

    Chad,
    IP addresses are layer three communications which are routers. You dont need a router in the same network, switches use hardware address anyways which is you MAC address.

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    What is difference between baseband and broadband transmission?

    In a baseband transmission, the entire bandwidth of the cable is consumed by a single signal. In broadband transmission, signals are sent on multiple frequencies, allowing multiple signals to be sent simultaneously.

    NEERAJ SINGH

    • Sep 5th, 2011

    In a baseband transmission, the entire bandwidth of the cable is consumed by a single signal. In broadband transmission, signals are sent on multiple frequencies, allowing multiple signals to be sent ...

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    Name three network tools used to determine where a network connectivity is lost between two sites A&B?

    TheDude

    • Aug 2nd, 2006

    PINGIMCP echo request utility. This utility is excellent for rudimentary estimation of the round-trip time and packet loss rate between hosts.TRACEROUTE (Win32 and *NIX versions differ somewhat)UDP/IC...

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    What is RIP (Routing Information Protocol)?

    It is a simple protocol used to exchange information between the routers.

    monami85

    • Jun 3rd, 2008

    Rip is a true distance vector routing algorithm.Every 30seconds rip sends it complete routing table out to all active interfaces.RIP uses hop count to determine the best way to reach a remote network,...

    RameshKumar Kaliamoorthi

    • Dec 5th, 2006

    RIP is one of the most enduring of all routing protocols. RIP is also one of the more easily confused protocols because a variety of RIP-like routing protocols proliferated, some of which even used th...

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    What is BGP (Border Gateway Protocol)?

    It is a protocol used to advertise the set of networks that can be reached with in an autonomous system. BGP enables this information to be shared with the autonomous system. This is newer than EGP (Exterior Gateway Protocol).

    Boti Curry

    • Jan 5th, 2007

    BGP stands for Border Gateway Protocol. It is an inter-AS ( Autonomous System Routing Protocol ). BGP is the routing protocol that runs the Internet. BGP is used to interconnect network islands ( ASs ...

    gautam chandra pandey

    • Feb 9th, 2006

    In the BGP,the criterion is the policy,which can be set by the Administrator .the policy defines what paths should be chosen.

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    What is point-to-point protocol?

    A communications protocol used to connect computers to remote networking services including Internet service providers.

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    SATA hard disk

    full form of SATA hard disk

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    Bharara88  

    • Member Since Jun-2008 | Jun 25th, 2008


    Serial Advanced Technology Attachment ( is a computer bus primarily designed for transfer of data between a computer and mass storage devices such as hard disk drives and optical drives.The main advantages over the older parallel ATA interface are faster data transfer, ability to remove or add devices while operating (hot swapping), thinner cables that let air cooling work more efficiently, and more reliable operation with tighter data integrity checks.

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    How can we configure dhcp features in an switch?

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    Answered by: Kalyan Raghavan

    • Jan 28th, 2006


    DHCP is only available on newer IOS-based switches. For example, Catalyst 3550 and 3750 offer DHCP.

    Let us take Cisco 2611 router running IOS12.2

    To begin, connect the router's Ethernet port to a switch, and connect the switch to a laptop, which will serve as the DHCP client.

    To configure Cisco IOS DHCP, follow these steps, which include sample commands:

    1. Configure an IP address on the router's Ethernet port, and bring up the interface. (On an existing router, you would have already done this.)

    Router(config)# interface ethernet0/0
    Router(config-if)#ip address 1.1.1.1 255.0.0.0
    Router(config-if)# no shutdown

    1. Create a DHCP IP address pool for the IP addresses you want to use.

    Router (config)# ip dhcp pool mypool

    1. Specify the network and subnet for the addresses you want to use from the pool.

    Router(dhcp-config)# network 1.1.1.0 /8  

    1. Specify the DNS domain name for the clients.

    Router(dhcp-config)#domain-name mydomain.com

    1. Specify the primary and secondary DNS servers.

    Router(dhcp-config)#dns-server 1.1.1.10 1.1.1.11

    1. Specify the default router (i.e., default gateway).

    Router(dhcp-config)#default-router 1.1.1.1

    1. Specify the lease duration for the addresses you're using from the pool.

    Router(dhcp-config)#lease 7

    1. Exit Pool Configuration Mode.

    Router(dhcp-config)#exit

    This takes you back to the global configuration prompt. Next, exclude any addresses in the pool range that you don't want to hand out.

    For example, let's say that you've decided that all IP addresses up to .100 will be for static IP devices such as servers and printers. All IP addresses above .100 will be available in the pool for DHCP clients.

    Next, enter the ipconfig /renew command on the laptop to receive an IP address. After you have the IP address, enter the ipconfig /all command.

    Kalyan Raghavan

    • Jan 28th, 2006

    DHCP is only available on newer IOS-based switches. For example, Catalyst 3550 and 3750 offer DHCP. Let us take Cisco 2611 router running IOS12.2To begin, connect the router's Ethernet port to a switc...

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    What is NETBIOS and NETBEUI?

    NETBIOS is a programming interface that allows I/O requests to be sent to and received from a remote computer and it hides the networking hardware from applications.NETBEUI is NetBIOS extended user interface. A transport protocol designed by microsoft and IBM for the use on small subnets.

    sunil

    • Dec 16th, 2005

    NETBIOS it describes the basic information of the n/wNETBEUI : Network Bios Extended User Interfacemainly used by Microsoft