network fundamental
Post on 23-Feb-2017
228 Views
Preview:
TRANSCRIPT
Networks fundamentals
by assistant lecturer
Fuad Ali3/26/2013
FUAD ALI
Types of Networks (geographically)
1. LAN - Local Area Network2. WLAN - Wireless Local Area Network3. WAN - Wide Area Network4. MAN - Metropolitan Area Network5. SAN - Storage Area Network, System Area Network, Server Area Network, or sometimes Small Area Network6. CAN - Campus Area Network, Controller Area Network, or sometimes Cluster Area Network7. PAN - Personal Area Network8. DAN - Desk Area Network
FUAD ALI
The DifferencesBetweenLAN & WAN
Types of Networks (no. of hosts)
Computer Identifiers
1.Computer Name : 256 characters (unique inside only , non-standard)2.Host Name : 256 characters (always unique , standard)3.IP Address : 4 bytes (always unique , standard)4.MAC Address : 6 bytes (always unique , standard)
MAC : B.C. FF FF FF FF FF FF IP : B.C. all host potion bits converted to 1s or 255 in decimal
Port No. : 0 – 1023 reserved for applications
Physical Addressing = MAC in layer 2
Logical Addressing = IP in layer 3
Identify service = Port No. in layer 4
Types of Addressing
Types of IPs
abbreviated Invisible Ranges (non routed addresses) Class
10.0.0.0 / 8 10.0.0.1 – 10.255.255.254 16000000 A
172.16.0.0 / 12 172.16.0.1 – 172.31.255.254 10000000 B
192.168.0.0 / 16 192.168.0.1 – 192.168.255.254 65000 C
1. Private IP Addresses
2. Private IP Addresses
3. 127.x.x.x !!?
4. 0.0.0.0 !!?
IP Address & subnet maskClass Mask High bits IP ranges
A 255.0.0.0 = /8 0 1.0.0.1 – 126.255.255.254
B 255.255.0.0 =/16 10 128.0.0.1 – 191.255.255.254
C 255.255.255.0 =/24 110 192.0.0.1 – 223.255.255.254
Why subnet mask ?
Characteristic IPv4 IPv6
Format
x.x.x.x
4, 8-bit fields
Separated by dots
x:x:x:x:x:x:x:x
8, 16-bit fields
Separated by colons
Field Representation Decimal FormatGroups of 4 hexadecimal digits, case sensitive forA, B, C, D, E and F.
Leading Zeroes Omitted Optional
Successive Zero Fields Must be included Can be represented by “::” once
in an address.
IPv6 Addressing
IPv6 Addressing• IPv6 Representation • Any single, contiguous string of one or more 16-
bit segments consisting of all zeroes can be represented once with a double colon.
1080:0:0:0:8:800:200C:417A = 1080::8:800:200C:417A
FF01:0:0:0:0:0:0:101 = FF01::101
0:0:0:0:0:0:0:1 = ::1
0:0:0:0:0:0:0:0 = ::
IPv6 Addressing
• IPv6 Representation:– Prefix:• IPv4 prefix (the network portion of the address) can be
dotted decimal or bit count.• e.g. 198.10.0.0 255.255.255.0 or /16
• IPv6 prefix is always represented by bit count.– e.g. 3ef8:ca62:12:cc::2/64 16 32 48 64
UTP (Unshielded Twisted Pair) & STP( Shielded Twisted Pair)
Twisting provide :
1- protection against crosstalk, noise generated by adjacent pairs .
2- cancellation of the magnetic field EMI.
Straight UTP Cable
Side1 : WO O WG B WB G WBr Br T568B
Side2 : WO O WG B WB G WBr Br T568B
Cross-Over UTP CableSide1 : WO O WG B WB G WBr Br T568B
Side2 : WG G WO B WB O WBr Br T568A
Roll-Over UTP CableSide1 : WO O WG B WB G WBr Br T568B
Side2 : Br Br G WB B G O WO
LLC & MAC
Theoretically model
Implem
ented model
IPv6 vs IPv4 16 Bytes → 3.4 x 10 38 IP Addresses 4 Bytes → 4.3 x 10 9 IP Addresses
top related