This is my class home work.

1. Course Code: CSE 317
Course Title: Computer networks
Topics: Hub, switch, Router, Bridge, Repeater, Transmission
Mode(Simplex, Half-Duplex, Full-Duplex), Computer Network(LAN,
MAN,WAN,CAN),IP Address.
Submitted To:
Pranab Bandhu Nath
Senior Lecturer,
CSE Department,
City University, Dhaka
Submitted By:
Name: Supriya Debnath
ID: 1915002506
Batch: 50th

2. Hub: A hub is a physical layer networking device which
is used to connect multiple devices in a network. Hub is a
network hardware device for connecting multiple Ethernet
devices together and making them act as a single network
segment.
Switch: A network switch is a multiport network bridge
that uses MAC addresses to forward data at the data link
layer of the OSI model.
• Devices are connected to the switch using Ethernet cables
creating a small LAN.
• The switch learns the MAC addresses of the connected
devices.
• When traffic needs to go to a specific device, the switch
sees the MAC address in the packet and sends it
to only that device.
Router: Routers are the network devices that route
packets between networks. Multiple subnets within the
same WAN to the internet connection that allows you
to read this article .

3. Bridge: A network bridge is a computer networking device that
creates a single, aggregate network from multiple communication
networks or network segments. This function is called network
bridging. Bridging is distinct from routing.
• A network switch
• A device that can connect two networks using
different connection mediums, such as connecting
a WLAN to a wired LAN.
Repeater: Repeaters are used to extend transmissions
so that the signal can cover longer distances or be
received on the other side of an obstruction. Repeater has
the potential to strengthen signals so as that it are often
retransmitted much stronger with better performance.
==============================
Simplex: In Simplex mode, the communication is
unidirectional, as on a one-way street. Only one of the two
devices on a link can transmit, the other can only receive.
The simplex mode can use the entire capacity of the
channel to send data in one direction. Example: Keyboard
and traditional monitors.

4. Half Duplex: In half-duplex mode, each station can both
transmit and receive, but not at the same time. When one
device is sending, the other can only receive, and vice
versa. The half-duplex mode is used in cases where there
is no need for communication in both directions at the
same time.
Full Duplex: Full-duplex data transmission means that
data can be transmitted in both directions on a signal
carrier at the same time. For example, on a local area
network with a technology that has full-duplex
transmission, one workstation can be sending data on the
line while another workstation is receiving data.
LAN: A local area network is a computer network that
interconnects computers within a limited area such as a
residence, school, laboratory, university campus or office
building. By contrast, a wide area network not only covers
a larger geographic distance, but also generally involves
leased telecommunication circuits. Home Wi-Fi networks
and small business networks are common examples of LANs.

5. Metropolitan Network: A metropolitan area network
(MAN) is a computer network that connects computers
within a metropolitan area, which could be a single large
city, multiple cities and towns, or any given large area with
multiple buildings. A MAN is larger than a local area
network (LAN) but smaller than a wide area network
(WAN).
WAN: A wide area network (WAN), is a large network of
information that is not tied to a single location. WANs can
facilitate communication, the sharing of information and
much more between devices from around the world
through a WAN provider.
CAN: A campus area network (CAN) is a computer
network that spans a limited geographic area. CANs
interconnect multiple local area networks (LAN) within an
educational or corporate campus. Most CANs connect to
the public Internet. ... In contrast, MANs and WANs may
combine infrastructure operated by several different
providers.

6. Whereto internet must be exist Mac Address
1 2
Mac Mac
Physical Address
48bit
24bit 24bit
OUI VS
Organization Unit Identifier Vandor Spceification

7. Internet Protocol:
Protocol means rules and regulation
Layer 3 protocol that forwards datagrams across internet
Uses routing tables prepared by routing protocols, Open
Shortest Path First (OSPF), Routing Information Protocol (RIP)
Connectionless service vs connection-oriented (circuits).
32bit
iPv4 iP6
Public IP Private IP
Id- 0-255 255 still can this assign
ID 101. 205. 255. 127
8bit 8bit 8bit 8bit 8bit means octal
Network IP = host id IP
IP Address

8. Class A 1-126
Class B 128-191
Class C 192-223
Class D 224-239
Class E 240-255