ACN VIVA Question and Answers

Topics: OSI model, Internet Protocol, Internet Protocol Suite Pages: 32 (6451 words) Published: May 17, 2014
Computer Network Lab Viva Questions

services etc the firewall is playing a vital roles in computer networks.

What is meant by Router ?
What is the Difference between HUB and SWITCH ?
A router is an electronic device that interconnects two or
more computer networks, and selectively interchanges
packets of data between them . A router is a networking
device whose software and hardware are customized to the
tasks of routing and forwarding information .
What is meant by Hubs ?
A common connection point for devices in a network. Hubs
are commonly used to connect segments of a LAN. A hub
contains multiple ports. When a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.
What is meant by Bridges ?
A network bridge connects multiple network segments at the
data link layer (layer 2) of the OSI model.Bridges come in
three basic types:





Local bridges: Directly connect local area networks
(LANs)
Remote bridges: Can be used to create a wide area
network (WAN) link between LANs. Remote bridges,
where the connecting link is slower than the end
networks, largely have been replaced with routers.
Wireless bridges: Can be used to join LANs or
connect remote stations to LANs.

What do u mean by NIC (Network Interface Card) ?

HUB-it is a network device that provide a central
connection on for cables from work station , server etc.the hub take incoming single one port and provide every port so that is main reason for collision.
switch.it also provide central connection to the work station.it provide the unique cast.it is better than a hub.
HUB HUb (1)work on physical layer in osi model
(2) Hub is half dupllex
(3) collision detection is on in hub
(4) Hub broadcast of transmitted message.

Switch (1) switch work in data link layer in osi model
(2) switch work half and full duplex
(3) collision detection is off
(4) switch transmitted messagee unicast and some time
broadcast.
Difference between Physical Address and
Logical Address ?
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.

A network card, network adapter, or NIC (network interface
card) is a piece of computer hardware designed to allow
computers to communicate over a computer network. It
provides physical access to a networking medium and often
provides a low-level addressing system through the use of
MAC addresses.

What is MAC Address ?

What do u mean by Repeater ?

PING stands Packet Internet Gopher. This is a utility for
ensuring connectivity between computers . ICMP protocol
works behind this utility. Under it , sending node sends
packets to destination node and reply is received if there is proper communication between two.

A repeater is an electronic device that receives a signal,
cleans it of unnecessary noise, regenerates it, and retransmits it at a higher power level, or to the other side of an
obstruction, so that the signal can cover longer distances
without degradation.
Definitions of Firewall ?
Firewalls are the most important aspect of the network
and its security in today's era. Due to maximization of attacks on the networks from various groups stealing data, denying

A unique48 Bit address assigned to each network card. Its
also called as physical address.
What is PING Utility ?

Ping command use to check the Destination host or router
connetivity to use the icmp and echo packet.
What do u mean by Gateway ?
They relay packets among networks that have different
protocols (e.g. between a LAN and a WAN). They accept a
packet formatted for one protocol and convert it to a...
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