Find Interview Questions for Tws

Datalink layer is further divided into two sub layers
1. M.A.C.(Media Access Control)
2. L.L.C.(Logical Link Layer)
Here the packets are converted into frames because to
assign meaning to bit and bytes
Main Responsibilities are
1. Framing
2. Physical Adderessing.
3. Flow Control and
4. Access Control

The data link layer transforms the physical layer(a raw
transmission facility) to a reliable link. It makes
physical layer appear error free to the upper layer.
Specific responsibilities of DLL include
1)Framing
2)physical addressing
3)Flow control
4)Error control
5)Access control

they are-
1.) repeater
2.) bridges
3.) routers
4.) gateways
5.) brouters

Repeater and hub are layer 1 devices(Physical layer)
Bridge and switch are layer 2 devices(Datalink layer
Router and Layer-3 switch are layer 3 device(Network layer)

Coaxial cable comes in two versions: Thinnet and Thicknet.
Thinnet looks like regular TV cable.* It is about 1/4 inch
in diameter and is very flexible and easy to work with. In
contrast, Thicknet is about 1/2 inch in diameter and not
very flexible. Thicknet is older and not very common
anymore except as a backbone within and between buildings.
Coax transmits at 10 Mbps.. Twisted Pair. Twisted pair
looks like telephone wire and consists of insulated strands
of copper wire twisted together.
There are two versions of twisted pair cable: Shielded
Twisted Pair (STP) and Unshielded Twisted Pair (UTP).
STP is commonly used in Token Ring networks and UTP in
Ethernet networks where it is referred to as "10baseT."
Transmission rates vary between 10-100 Mbps..Fiber-Optic
Cable.
Fiber- optic cable consists of a thin cylinder of glass
surrounded by glass cladding, encased in protective outer
sheath. Fiber-optic cable is very fast (100 Mbps). It can
transmit over long distances (2 km +) but is expensive.