A local area network (LAN) is a computer network covering a small physical area, like a home, office, or small group of buildings, such as a school, or an airport.
Lan stands for local area network.A number of systems conneted in a physical connectivity in a limited geographycal location that is called lan.It provides full time connective.
VLAN is technology in which we can administratively assign different ports of same layer to switch to different subnetworks.
In the 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.
In baseband transmission we transmit digital signal without converting it into analog, here a low pass channel is used.
In broadband transmission we transmit digital signal by converting it into analog. here a band pass channel is used.
Also called a regenerator, it is an electronic device that operates only at physical layer. It receives the signal in the network before it becomes weak, regenerates the original bit pattern and puts the refreshed copy back in to the link.
Bridges:
These operate both in the physical and data link layers of LANs of same type. They divide a larger network in to smaller segments. They contain logic that allow them to keep the traffic for each segment separate and thus are repeaters that relay a frame only the side of the segment containing the intended recipent and control congestion.
Routers:
They relay packets among multiple interconnected networks (i.e. LANs of different type). They operate in the physical, data link and network layers. They contain software that enable them to determine which of the several possible paths is the best for a particular transmission.
Gateways:
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 packet formatted for another protocol before forwarding it. They operate in all seven layers of the OSI model.
I Think Switches has left both layer 2 and 3. Bridges aren't used these days and it also work on data link layer and not on physical layer.
Switches (L2)
--------
It breaks collasion domain.Uses MAC address to communicate. Faster than bridges.
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.
PING : Packet Internet Gropper
it's a diagnostic utility , which diagnose devices connectivity.
it use ICMP: Internet Control Messaging protocol to send echo requests ( usually 4 packets) and receive echo replies (4 packets)
Webmaster 22nd of May 2012
Tell us what you feel about LAN (Local area network) Interview Questions and Answers
All comments will be published after review. No login or registration is required to post a comment on LAN (Local area network) Interview Questions and Answers We offer and invite you to submit your valuable comment now; Please be respectful of others when commenting. Insulting others, self-promotional comments, website promotional comments, marketing stuff, SEO Techniques, SMS-style content and off-topic comments will not be approved at this information portal.
So start sharing your thoughts regarding LAN (Local area network) Interview Questions and Answers
Thank you.