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A local area network (LAN) is a computer network that interc

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Özge Erten

on 25 October 2014

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Transcript of A local area network (LAN) is a computer network that interc

Local area network
A local area network (LAN) is a computer network that interconnects computers within a limited area such as a home, school, computer laboratory, or office building, using network media.
What is the VLAN?
A VLAN is a set of workstations within a LAN that can communicate with each other as though they were on a single, isolated LAN.
VLAN's allow a network manager to logically segment a LAN into different broadcast domains .VLAN's also allow broadcast domains to be defined without using routers.
1.Physical View
2.Logical View
1.Physical View
1) Layer 1 VLAN: Membership by Port

1 1
2 1
3 2
4 1

2) Layer 2 VLAN: Membership by MAC Address

MAC Address VLAN
1212354145121 1
2389234873743 2
3045834758445 2
5483573475843 1

Types of VLAN's
3) Layer 2 VLAN: Membership by Protocol Type

Protocol VLAN
IP 1

4) Layer 3 VLAN: Membership by IP Subnet Address

IP Subnet VLAN
23.2.24 1
26.21.35 2

5) Higher Layer VLAN's

What is DNS?
The DNS translates Internet domain and host names to IP addresses. DNS automatically converts the names we type in our Web browser address bar to the IP addresses of Web servers hosting those sites.
How the DNS works?
Internet Protocol address.

An IP address is assigned to every computer on an Ethernet network.

32 bits (IPv4) Ex:

128 bits (IPv6) Ex:1999:6:13:0:0:1962:2:15
Network ID

Host ID
IP Address Class
Class A, Class B, Class C, Class D, Class E.
IP Address Class / IP Address / Network ID / Host ID
A w.x.y.z w.0.0.0 1-126
B w.x.y.z w.x.0.0 128-191
C w.x.y.z w.x.y.0 192-223
D w.x.y.z not valid 224-239
E w.x.y.z not valid 240-255 (A class) (B class) (C class)
What is a DHCP
Dynamic Host Configuration Protocol
DHCP is a client/server protocol that automatically provides an Internet Protocol (IP) host with its IP address and other related configuration information such as the subnet mask and default gateway.
DHCP Operating Principles
DHCP discover
DHCP offer
DHCP request
DHCP acknowledgement
Ip address
Default gateway address
Subnetmask address
Dns address
1-Destination IP address (not yet approved):

2-Hedef MAC adresi(known,client):00-A0-CC-66-73-1F

3-Kaynak IP Adresi(known,DHCP server):

4-Kaynak MAC Adresi(known,DHCP server):00-A0-C0-B6-12-6F
1-Destination IP address (unknown): (broadcast)

2-Destination MAC address(unknown): FF.FF.FF.FF.FF.FF.FF(broadcast)

3-Source IP Address(unknown):

4-Source MAC Address:00-A0-CC-66-73-1F
How VLAN's work?
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