NETWORK PROTOCOLS AND SERVICE · 2018. 12. 20. · y Domain Naming, Top Lavel Domains, Second Level...
Transcript of NETWORK PROTOCOLS AND SERVICE · 2018. 12. 20. · y Domain Naming, Top Lavel Domains, Second Level...
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UNIT 2
NETWORK PROTOCOLS
AND SERVICE
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SYLLABUS 2.1 Dynamic Host Control Protocol(DHCP):
DHCP Origins :ARP,RARP,BOOTP
DHCP Objectives,
IP Address assignments,
DHCP Architecture.
2.2 Introduction to Domain Name Systems (DNS)
DNS Objectives
Domain Naming, Top Lavel Domains, Second Level Domains, Sub-
domains
DNS Functions, Resource Records, DNS Name Resolution, Resolves,
DNS Requests, Root Name Servers, Resolving a Domain Name, DNS
Name Registration
2.3 Network Printing Concepts
Locally Connected Print Devices,
Setting up local Print Devices,
Shared Print Devices,
Sharing Locally Attached Print Devices,
Describe Windows Network Printing and Add print Wizard.
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2.1 DHCP ORIGINS: ADDRESS RESOLUTION
PROTOCOL(ARP)
Address Resolution Protocol (ARP) is a protocol for
mapping an Internet Protocol address (IP address) to a
physical machine address that is recognized in the
local network.
ARP stands for Address Resolution Protocol.
When you try to ping an IP address on your local
network, say 192.168.1.1, your system has to turn the
IP address 192.168.1.1 into a MAC address. This
involves using ARP to resolve the address, hence its
name.
Systems keep an ARP look-up table where they store
information about what IP addresses are associated
with what MAC addresses.
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ARP CONT…
When trying to send a packet to an IP address, the
system will first consult this table to see if it already
knows the MAC address. If there is a value cached,
ARP is not used.
If the IP address is not found in the ARP table, the
system will then send a broadcast packet to the
network using the ARP protocol to ask "who has
192.168.1.1". Because it is a broadcast packet, it is
sent to a special MAC address that causes all
machines on the network to receive it. Any machine
with the requested IP address will reply with an ARP
packet that says "I am 192.168.1.1", and this includes
the MAC address which can receive packets for that IP
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ARP Cont…
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2.1 DHCP ORIGINS: REVERSE ADDRESS
RESOLUTION PROTOCOL(RARP)
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It is the opposite of Address Resolution Protocol.
RARP works by broadcasting a system’s hardware
address and receiving an IP address return from a
RARP server.
It is designed for use with diskless work station that
has no means to store their owned TCP/IP
configuration information.
RARP server can supplied IP addresses to all of the
system on a network segment.
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RARP CONT….
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DHCP Origins CONT….
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2.1 DHCP ORIGINS: BOOTSTRAP PROTOCOL
The Bootstrap Protocol (BOOTP) is a computer
networking protocol used in Internet Protocol
networks to automatically assign an IP address to
network devices from a configuration server.
The BOOTP was originally defined in RFC 951
BOOTP does not use leases.
Usually operates in two stages:
First, it gets its IP address
Next, it uses the TFTP protocol to boot its full
operating image
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BOOTP CONT…
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Two modes of operation: Request and Reply.
Request contains client’s hardware address and IP address if known; it may contain a requested server.
Usually contains a name of the file to use for booting
this client.
Response from the server contains answers to the
request.
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CONT…
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DYNAMIC HOST CONTROL
PROTOCOL(DHCP) Dynamic Host Configuration Protocol
Each machine that can connect to the Internet needs a unique IP address, which is assigned when an Internet connection is created for a specific computer.
It is a method for assigning Internet Protocol (IP) addresses permanently or to individual computers in an organization’s network.
DHCP lets a network administrator supervise and distribute IP addresses from a central point and automatically, sends a new IP address when a computer is plugged into a different place in the network
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Why is DHCP Important?
When computer requests an address, the administrator would have to manually configure the machine
Mistakes are easily made
Causes difficulty for both administrator as well as neighbors on the network
DHCP solves all the hassle of manually adding a machine to a network
CONT….
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IP ADDRESS ASSIGNMENTS The DHCP standard includes three different address
allocation mechanisms:
Manual Allocation: A particular IP address is pre-allocated to a single device by an administrator. DHCP only communicates the IP address to the device.
Automatic Allocation: DHCP automatically assigns an IP address permanently to a device, selecting it from a pool of available addresses.
Dynamic Allocation: DHCP assigns an IP address from a pool of addresses for a limited period of time chosen by the server, or until the client tells the DHCP server that it no longer needs the address
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The key word in DHCP is "dynamic." Because instead of having just one fixed and specific IP address, most computers will be assigned one that is available from a subnet or "pool" that is assigned to the network.
When DHCP assigns an IP address, it actually leases that connection identifier to the user's computer for a specific amount of time.
The default lease is five days.
Short lease time is useful in education and other environment where users change frequently.
HOW DHCP WORKS?
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DHCP also supports static addresses for computer that
need a permanent IP address, such as Web Server.
Here is how the DHCP process works when you go online
You log on your computer to connect to the Internet.
The network requests an IP address (this is actually
referred to as a DHCP discover message).
On behalf of your computer's request, the DHCP
server allocates (leases) to your computer an IP
address. This is referred to as the DHCP offer
message.
CONT….
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Your computer (DHCP client) takes the first IP
address offer that comes along. It then responds with a
DHCP request message that verifies the IP address
that's been offered and accepted.
DHCP then updates the appropriate network servers
with the IP address and other configuration
information for your computer.
Your computer (or whatever network device you're
using) accepts the IP address for the lease term.
CONT….
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To obtain a lease, DHCP client initiates a conversation
with a DHCP server using a series of DHCP messages.
INTERACTION BETWEEN CLIENT AND
SERVER
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INTERACTION BETWEEN CLIENT
AND SERVER DHCP DISCOVER: Used by client to locate DHCP server
and request IP Address.
DHCP OFFER: Used by server to offer IP Address to server.
DHCP REQUEST: Used by client to request specific IP
Address.
DHCP DECLINE: Used by client to reject an IP Address
offered by a server.
DHCP ACK: Used by server to acknowledge a client’s
acceptance of offered IP address.
DHCP NAK: Used by server to reject a client’s acceptance of
offered IP address.
DHCP RELEASE: Used by clients to terminate a lease.
DHCP INFORM: Used by clients that have already been
assigned an IP address to request additional configuration
parameters.
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DHCP architecture consists of DHCP clients, DHCP
server and DHCP relay agents on a network.
DHCP ARCHITECTURE
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DHCP ARCHITECTURE
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DHCP Client:
A DHCP client is any network-enabled device that
supports the ability to communicate with a DHCP
server in compliance with RFC 2131, for the
purpose of obtaining dynamic leased IP
configuration and related optional information.
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DHCP provides support for client computers running
any of the following operating systems.
Windows Vista
Windows Server 2008
Windows XP
Windows Server 2003
Windows 2000
Windows 98
Windows NT version 4.0
CONT….
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DHCP Server:
DHCP Server is used to centrally allocate TCP/IP
configuration to computers automatically without
setting it manually.
It saves time to setup and manage TCP/IP network , if
network is big.
If the IP address is actively used, computer will ask the
server to renew the lease.
CONT….
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DHCP Relay Agent:
It passes DHCP requests from one LAN to another so
that there need not be a DHCP server on every LAN.
It is a small program that relays DHCP/BOOTP
messages between clients and servers on different
subnets.
A relay agent relays DHCP/BOOTP messages that are
broadcast on one of its connected physical interfaces,
such as a network adapter, to other remote subnets to
which it is connected by other physical interfaces.
CONT….
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DHCP Server should be able to provide workstation
with all the settings needed to configure the TCP/IP
client, so that no manual configuration is needed.
It should assign IP address to prevent duplication of
addresses on the network.
DHCP server should support the assignment of specific
IP addresses to specific client system.
It should be able to configure clients on other subnet
through the use of relay agents.
DHCP OBJECTIVES
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DHCP MESSAGE FORMAT(PACKET STRUCTURE)
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DHCP minimizes the administrative burden
By using DHCP there is no chance to conflict IP address
By using DHCP relay agent you provide IP address to another network
ADVANTAGES OF DHCP
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When DHCP server is unavailable, client is unable to
access enterprises network
Your machine name does not change when you get a
new IP address
DISADVANTAGES OF DHCP
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2.2 DOMAIN NAME SYSTEM
Understand the concept of domain name space
Distribution of name spaces
Use of DNS in the Internet
Define root server and zone
DNS Name Registration
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DNS Objectives
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CONT…
People prefer to use easy-to-remember names instead
of IP addresses .
Domain names are alphanumeric names for IP
addresses e.g., www.yahoo.com, www.google.com
The domain name system (DNS) is an Internet-wide
distributed database that translates between domain
names and IP addresses.
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DOMAIN NAMING
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CONT…
Unique domain suffix is assigned by Internet
Authority.
The domain administrator has complete control over
the domain
No limit on number of subdomains or number of levels
Ex. computer.site.division.company.com
computer.site.subdivision.division.company.com
Domains within an organization do not have to be
uniform in number of subdomains or levels
DNS name is like a postal address, in which top level
domain is state, second level domain is the city and the
host name is street address.
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TOP LEVEL DOMAIN(TLD)
1.In any DNS name, the rightmost word represents
domain at the highest level in DNS tree, called a top-
level domain.
2.Top level domains functions as registrars for the
domains at second level.
3.Ex. mycorp.com uses top level domain “com” and
registered the name “mycorp”.
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CONT…
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Seven top-level dedicated domains…
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COUNTRY-CODE DOMAINS
There are 191 country code domains named for specific
countries in there own languages.
Ex. For India its in.
80 out of 191 allows free registration of top-level
domains.
For remaining 111 countries, an organization must
conform to some tax or guideline in order to register a
second level domain.
Each of these country code domain is managed by an
organization in that country, which has its own domain
name registration policies.
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SECOND LEVEL DOMAIN(SLD)
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It is directly below a Top Level Domain.
Example: In example.com, example is the second
level domain of the .com TLD.
It refer to the organization that registered the
domain name with a domain name registrar.
Some domain name registries introduce a second
level hierarchy to a TLD that indicates the type of
entity intended to register an SLD under it.
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SUB DOMAINS
Large organizations need sub domains to subdivide their networks according to their networks according to geographical or organizational boundary.
Sub domains are used to maintain large domain .
The DNS server of top-level contains address of second level domains. Same way second level domain contains address of third level domains.
To make this possible, DNS server break up domains name space in zones.
A domain with only two level consists of single zone.
Three level domain can be divided into multiple zones.
A zones can be continuous branch of a DNS tree that can include domains on multiple level. 37
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CONTINUE…
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USA
SALES
PARIS
ZACKER
NETWORK
Zone B
ROOT
ORG COM NET
Zone A
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CONT…
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DNS Functions
1. DNS Resource Records
DNS resource record defines data types in the DNS.
Resource records are stored in binary format
internally for use by DNS software.
Resource records are sent across a network in text
format while they perform zone transfers.
Whenever a resolver gives the domain name to DNS
it gets the resource record associated with it.
Each resource record has five fields :
Domain
Name
Class Type Time to
Live
Value
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CONT…
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2. DNS Name Resolution
User program issues a request for the IP address
of a hostname
Local resolver formulates a DNS queryto the name
server of the host
Name server checks if it is authorized to answer
the query.
if yes, it responds.
Otherwise, it will query other name servers,
starting at the root tree
When the name server has the answer it sends it to
the resolver
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CONT…
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Resolvers
An application program on a host accesses the
domain system through a DNS client, called the
resolver.
Resolver contacts DNS server, called name server
.
DNS server returns IP address to resolver which
passes the IP address to application
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CONT…
DNS Request
There are two types of queries:–
Recursive queries
Iterative (non-recursive) queries
The type of query is determined by a bit in the DNS
query.
Recursive query: When the name server of a host
cannot resolve a query, the server issues a query to
resolve the query
Iterative queries: When the name server of a host
cannot resolve a query, it sends a referral to another
server to the resolver
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CONT…
Root Name Server
The root name servers know how to find the
authoritative name servers for all top- level zones.
There are only 13 root name servers
Root servers are critical for the proper functioning of
name resolution
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CONT…
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Resolving a Domain Name
Mapping a name to an address or an address to a
name is called name-address resolution.
A host that needs to map an address to a name or a
name to an address calls a DNS client called a
resolver.
The resolver accesses the closest DNS server with a
mapping request.
If the server has the information, it satisfies the
resolver ;otherwise, it refers the resolver to other
servers to provide the information
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DNS Name Registration
If you have a web site and to register own domain
name then this is done through a registrar.
A registrar first verifies that the requested domain
name is unique and enters into the DNS Database.
To register, the organization needs to give the name
of its server and the IP address of the server to the
registrar.
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2.3 NETWORK PRINTING CONCEPT
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Local Printer, Shared printer and Network printer are
the three basic printingg configurations.
A software is required to control the printing process.
The printer determines where and when the output
should be sent.
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Setting up Local Print Device
To install a local print device, use the Add Print Wizard.
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When Prompted, select Local Printer And Press next
button
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After selecting a port press NEXT button.
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Select Printer manufacturer in left pane, all
printers available of that manufacturer will display
in right pane. Select appropriate printer and press
next.
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CONT…
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Give a “share name” if you want to share this printer
otherwise select “Do not share this printer”. And press
“next”
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If you want to test a print page then, select “yes”, otherwise select “no” and then press Next button.
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CONT…
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Now you can see “Devices and Printers ” window.
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To Share a Print Device
1. Click the Start menu, then select "Devices and
Printers."
2. Right-click the printer you want to share, then click
Printer properties.
3. Click the Sharing tab, and check the box next to
"Share this printer.”
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CONT…
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Network Print Device
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TO USE SHARED PRINTER FOLLOW THE
STEPS.
1. Click the Start menu, then select "Devices and
Printers."
2. Select "Add a printer."
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Select “add a printer using TCP/IP address”
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Specify IP address for printer host.
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Searching printer in network.
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Next based on IP address you provided, it will
search printer.
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Choose device type.
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Select driver for printer appropriate to the
printer shared in network.
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Choose printer name.
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Select “print a test page” and FINISH.
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IMP QUESTION FOR GTU EXAM
Explain Address Resolution Protocol.
Explain Reverse Address Resolution Protocol.
Explain BOOTP Protocol.
Explain DHCP architecture.
Explain DHCP Packet format.
Explain Domain Name System Objectives.
Explain function of DNS Server.
List and explain TOP Level Domain.
Explain Country Level Domain.
Explain Name resolver.
Explain types of IP address assignment.
Write a steps to Install Network Printer
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