This document provides a summary of network protocols. It defines a network as a set of connected devices that can send and receive data. It explains that network protocols establish detailed rules for how computer systems exchange information. The document then overview Reverse Address Resolution Protocol (RARP) and several other key network protocols, including Internet Protocol (IP), Address Resolution Protocol (ARP), Internet Group Message Protocol (IGMP), and Internet Control Message Protocol (ICMP). For each protocol, it provides high-level descriptions of their functions and operations in 2 sentences or less.
Overview of RARP, BOOTP, DHCP and PXE protocols for dynamic IP address assignment.
Dynamic IP address assignment to a host (or interface) is a common problem in TCP/IP based networks.
Manual and static assignment of IP addresses does not scale well and becomes a labor intensive task with a growing number of hosts.
An early approach for dynamic IP address assignment was RARP (Reverse ARP) which ran directly on the Ethernet protocol layer.
The many problems of RARP such as the inability to be routed between subnets were solved with BOOTP (Bootstrap Protocol).
BOOTP, however, ended to have its own set of limitations like lack of a lease time for IP addresses.
DHCP (Dynamic Host Configuration Protocol) was therefore defined as an extension to BOOTP.
DHCP is backward compatible with BOOTP thus allowing some degree of interoperability between the 2 protocols.
The state-of-the-art protocol for dynamic IP address assignment is, however, is DHCP.
DHCPv6 is an adaption of DHCP for IPv6 based networks.
Overview of IP routing protocols, packet forwarding and proxy ARP.
The principle of IP routing proved to be very flexible and scalable in the growth of the Internet and TCP/IP based networks.
IP routing denotes protocols for exchanging IP address range reachability like RIP, BGP and OSPF.
In contrast to IP routing, IP packet forwarding collectively means all functions performed when an IP router receives a packet and forwards it over the output interface indicated by an IP route in the routing table.
When an IP router performs a route lookup, it calculates a route decision based on different properties like prefix (mask) length, route precedence and metrics.
Routing protocols for exchanging route information can be coarsely classified as distance vector and link state protocols. Distance vector protocols like RIP (Routing Information Protocol) exchange information about the path cost to specific targets (IP address ranges). Routers that talk distance vector protocols receive reachability information about all sub-networks indirectly from neighboring routers.
In contrast to distance vector protocols, link state protocols like OSPF disseminate information about the link state of each router link in a network to all routers in the network. Thus link state protocols tend to converge faster to topology changes since all routers have firsthand information of the topology of the network.
Proxy ARP may be a convenient solution when it comes to add additional subnets without having to add routes to routers and hosts. A proxy ARP enabled router would answer ARP requests on behalf of the targeted hosts mimicking a local network access to the requesting host.
Overview of RARP, BOOTP, DHCP and PXE protocols for dynamic IP address assignment.
Dynamic IP address assignment to a host (or interface) is a common problem in TCP/IP based networks.
Manual and static assignment of IP addresses does not scale well and becomes a labor intensive task with a growing number of hosts.
An early approach for dynamic IP address assignment was RARP (Reverse ARP) which ran directly on the Ethernet protocol layer.
The many problems of RARP such as the inability to be routed between subnets were solved with BOOTP (Bootstrap Protocol).
BOOTP, however, ended to have its own set of limitations like lack of a lease time for IP addresses.
DHCP (Dynamic Host Configuration Protocol) was therefore defined as an extension to BOOTP.
DHCP is backward compatible with BOOTP thus allowing some degree of interoperability between the 2 protocols.
The state-of-the-art protocol for dynamic IP address assignment is, however, is DHCP.
DHCPv6 is an adaption of DHCP for IPv6 based networks.
Overview of IP routing protocols, packet forwarding and proxy ARP.
The principle of IP routing proved to be very flexible and scalable in the growth of the Internet and TCP/IP based networks.
IP routing denotes protocols for exchanging IP address range reachability like RIP, BGP and OSPF.
In contrast to IP routing, IP packet forwarding collectively means all functions performed when an IP router receives a packet and forwards it over the output interface indicated by an IP route in the routing table.
When an IP router performs a route lookup, it calculates a route decision based on different properties like prefix (mask) length, route precedence and metrics.
Routing protocols for exchanging route information can be coarsely classified as distance vector and link state protocols. Distance vector protocols like RIP (Routing Information Protocol) exchange information about the path cost to specific targets (IP address ranges). Routers that talk distance vector protocols receive reachability information about all sub-networks indirectly from neighboring routers.
In contrast to distance vector protocols, link state protocols like OSPF disseminate information about the link state of each router link in a network to all routers in the network. Thus link state protocols tend to converge faster to topology changes since all routers have firsthand information of the topology of the network.
Proxy ARP may be a convenient solution when it comes to add additional subnets without having to add routes to routers and hosts. A proxy ARP enabled router would answer ARP requests on behalf of the targeted hosts mimicking a local network access to the requesting host.
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Protocols And IP suite PPT
Contents are
History
TCP/IP Suite Layer
a} Network Interface
b} Internet Layer
c} Transport Layer
d} Application Layer
3.Comparison of OSI and IP
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1. A Presentation Report
On
““ NETWORKNETWORK
PROTOCOLS ”PROTOCOLS ”
Electronics & Communication
Year 2012-13.
Submitted By:
Shah Nautami
2. NetworkNetwork :-:-
A network is a set of devices (often referred to as
nodes) connected by communication links. A
node can be a computer, printer, or any other
device capable of sending and/or receiving data
generated by other nodes on the network.
3. What is network protocol ?What is network protocol ?
The network protocol is a set of
very detailed rules, sequences, message
formats, and procedures that
computer systems use and understand
when exchanging data with each
other.
6. IP :-IP :-
Unreliable & connectionless datagram protocol –
best-effort delievery service.
Must be paired with a reliable protocol such as
TCP.
Ex. Post office service.
It transports data in packets called datagram. It
consisting of two parts : (1) Header & (2) Data.
Header contains information essential to routing
& delievery.
7. Version
(4 bits)
HLEN
(4 bits)
Service
type
(8 bits)
Total length
(16 bits)
Identification (16 bits) Flags
(3 bits)
Fragmentatio
n offset
(13 bits)
Time to live
(8 bits)
Protocol
(8 bits)
Header checksum
(16 bits)
Source IP address
Destination IP address
Option
Header Data
9. ARP :-
• ARP associates an IP address with its physical address. On aARP associates an IP address with its physical address. On a
typical physical network, such as a LAN, each device on atypical physical network, such as a LAN, each device on a
link is identified by a physical or station address that islink is identified by a physical or station address that is
usually imprinted on the NIC.usually imprinted on the NIC.
• ARP is used to find the physical address of the node whenARP is used to find the physical address of the node when
its internet address is known.its internet address is known.
• Anytime a host , or a router , needs to find the physicalAnytime a host , or a router , needs to find the physical
address of another host on its now , it format an ARP queryaddress of another host on its now , it format an ARP query
packet that includes the ip address and broadcast it over thepacket that includes the ip address and broadcast it over the
n/w .n/w .
15. RARPRARP :-
• RARP finds the logical address for aRARP finds the logical address for a
machine that only knows its physicalmachine that only knows its physical
address.address.
• The host wishing to retrieve its IPThe host wishing to retrieve its IP
address broadcasts an RARP queryaddress broadcasts an RARP query
packet that contains its physical addresspacket that contains its physical address
to every host on its physical network. ato every host on its physical network. a
server on the network recognizes theserver on the network recognizes the
RARP packet & returns the host ‘ s IPRARP packet & returns the host ‘ s IP
address .address .
16. WHY DO WE NEED RARP ?
A host to have its IP address store in its hard
disk .
Now what if the host is a dioskless computer .
OR what if computer is being connect to the n/w
for a first time .
OR what if you get new computer but you
decide to keep old NIC .
18. ARP and RARP :-
RARP works much like ARP.
The Internet is based on IP addresses .
Protocols may have different (MAC)
addresses .
The ARP and RARP protocols perform
the translation between IP addresses
and MAC layer addresses .
20. IGMP :-
Internet Group Management Protocol (IGMP) is a
communications protocol used by hosts and
adjacent routers on IP networks to establish
multicast group membership .
IGMP is an integral part of the IP multicast
specification. IGMP can be used for online
streaming video and gaming, and allows more
efficient use of resources when supporting these
types of applications .
IGMP is used on IPv4 networks.
22. IGMP OPERATION :-IGMP OPERATION :-
Host Operations
– To receive multicast datagram , a host
must join a group . To join a group , the
host sends an IGMP membership report
packet through an attached interface .
23. IGMP OPERATION :-
Multicast Router Operations
– Multicast routers listen to all multicast
addresses to detect
membership reports .
• 1. receiver (host) signals to join a group ,
• 2. creates an entry in the local group database .
• 3. To verify group membership , multicast routers
regularly send an IGMP
Query message .
26. ICMP :-ICMP :-
ICMP is used by host and routers to send
notification of datagram problems back to the
sender .
ICMP used for just error detection it will not correct
that error .
If a datagram travels from router to router untill
it reaches it one that can deliever it to its final
destination . If a router is unable to deliever the
datagram because of unsual conditions , ICMP
allows it to inform original source .
27.
28. ICMP messages :-
ICMP messages are divided into
error-reporting messages and query
messages.
The error-reporting messages report
problems that a router or a host
(destination) may encounter.
The query messages get specific
information from a router or another
host.
30. Destination-unreachable messages with
codes 3 can be created only by the
destination host .
Other destination-unreachable
messages can be created only by
routers.
Note:Note:
32. An echo-request message can
be sent by a host or router.
An echo-reply message is
sent by the host or router
which receives an echo-
request message.
Note:Note: