Communication Port

COM is a communication port. which is used in serial 
communication.

COM port is a SERIAL port.

I like interacting with people and a good problem solver. 
It is a growing company as equal to IT. Both IT and ITES 
work hand to hand and I think both there is an equal growth 
in ITES (IT enabled services) companies.

It is better you go to any consultancies they will help you 
with more logical answers to this type of questions.

The major thing is i want to devolp my communication 
skill,and i can interact with many people,if you are doing 
a course like ccna,mcse,other networking cources you can 
work in shift in call centre for example if you are working 
in 1pm to 10pm from the3morning you call go for networking 
class after pasing the exam you can go to the it company

Layer 2 belongs to LAN (intranet ) and Layer 3 belongs to 
WAN(internet)

LAYER 2                             LAYER 3

LAYER 2 DEVICE IS SWITCH           LAYER 3 DEVICE IS ROUTER
 
SWITCH DEALS WITH MAC ADDRESS      ROUTER DEALS WITH IP    
                                
                                   ADDRESS

USED TO CONNECT DIFFERENT          EXPANSION WITH IN A N\W
NETWORK           

DATA ARE IN PACKETS                 DATA ARE IN FRAME

Well, none of the above answers talk about QOS,

L2-QOS:
-------
It is clear that L2 is at MAC layer. In case of MAC level 
forwarding such as Bridge connction and a quality of 
service need to be assured, The following methods can be 
used:

1) MAC filtering (avoiding unnecessary traffic coming from 
known MAC sources)
2) VLAN & COS: VLAN will ensure that the traffic is 
classified based on various parameters like MAC address, 
incoming port, etc... COS: Class Of Service is a filed in 
VLAN header. This will be used to prioritize traffic. Later 
a QOS scheduler can use the COS filed to qualify the 
traffic in to different QOS queues.

L3 - QOS
--------

L3 QOS is required for IP level classification. 
Classification can be achieved by Diffserv implementations 
that takes many IP parameters in to consideration in 
prioritizing traffic. This priority can be set in TOS field 
of IP header. This TOS will later be used by Scheduling 
process to achieve QOS.

no

dynamic host configuration protocal, and it can assign ips
to clients automaticully.

go to network place and right click on it and go to 
propoties and go to tcpip protocol and set ip 
automatically.then automatically set ip address, this is 
known as DHCP , this is the way .

to set DHCP you need DHCP server or DHCP server capable
device such as cisco router etc... You then set the address
pool and excluded adresses then if it needs to be forwarded
off that  lan segment you need to set ip helper on the
recieving interface of the none DHCP server router recieving
the broadcast.  You will also need to configure the lease
time and default gateway etc..

its a simple way, jst go to network proporties and select
loacal area connection right click on proporties and select
the TCP/IP go proporties and then select the radio button to
automatically, thats it

i think if u hav a server os in ur system then go to 
windows component in control panel n select networking.. 
then detail where u will gwt a DHCP server option.. click 
it.. it will show u a welcome wizard... configure there n 
see will will get a dhcp tool in administrative tools in 
all program..

hope i hav given a correct answar

1-To set DHCP First  we need dhcp service that is taken 
from start-program-add or remove program-add remove windows 
component-network services- select dhcp-next-next-finish.
2-now start- program- admin tool- click on DHCP-r click on 
dhcp server - put start ip address as 192.168.0.10 and end 
ip address as 192.168.0.100 now follow the simple step if u 
want to reserve some ip address u can select reserve option 
here a lot of option u can set according to your need.
advantage- it will be provide ip address automatically.

fist of all when u want to set dhcp on the server side ---

step1- install dhcp by-- from start-seeting -control panal-
add or remove program-add remove windows 
component-network services- select dhcp-next-next-finish.

stap 2- configer dhcp--now start- program- admin tool- 
click on DHCP-r click on 
dhcp server - put start ip address as 192.168.0.10 and end 
ip address as 192.168.0.100 now follow the simple step if u 
want to reserve some ip address u can select reserve option 
here a lot of option u can set according to your need.

advantage- it will be provide ip address automatically.

Flash Memory is used to hold the Cisco IOS Image. Flash 
Memory is nothing but, Electronically Erasable Programmable 
Read Only Memory (ie EEPROM. Its a Chip)

NVRAM is used to hold Cisco IOS software image

NVRAM is used to store the "Start-up" configuration.

The Cisco IOS® software image is stored in Flash memory 
(usually in compressed form), but it is loaded into RAM 
before being executed by the router. Because the running 
software image then resides in RAM, a new software image 
can be downloaded and copied over the software image stored 
in Flash memory

Correct me, if it is wrong?

NVRAm

Flash memory stores the IOS & NVRAM stores startup config

Frame

processing data unit

protocol data unit(it is used for minmize the bandwidth)

The Data Link Layer encapsulates the network-layer 
information in a PDU called segment protocol data unit.

In a Company Or A Organization the Users Login Security 
Given By Administrator.

administrator

8 days

dhcp is nothing but who can assign ip addresses to clients
in that network he is dhcpserver.And minium lease duration
is 8 days and maximum lease duration is 999 days 23 hours
and 59 minutes that's nothing but one minute less 1000 days

Same as above given by  Dn.gopal1@gmail.com
but difference is one second...

dhcp is nothing but who can assign ip addresses to clients
in that network he is dhcpserver.And minium lease duration
is 8 days and maximum lease duration is 999 days 23 hours
and 59 minutes that's nothing but one Second less 1000 days

the minimum lease duration is 8 days 
and the maximum lease time is 959 days 23 hours and 52 mins

what is the purpose of lease duration?

Min. 8Days & Max. 999 days

if we are using router as a dhcp server then

min. lease :- 1 min.
max. lease :- 365 days 23 hrs. 59 min.

Well, Bydefault 8 Day's but it can be Min. 1 Day & Max. 999 
Days 23 Hours & 59 Minutes.

TCP/IP is open standard protocal and it is very fast 
communication protocal.

By using TCP/IP cost is less, very easy to handle, bandwidth
is high etc..

high bandwith with good security

TCP/IP waiting for acknoledgement and it fast and 
realibality.

b'coz it supports both wired & wireless(communication)

OSI
Standard legislated by official recognized body. (ISO)
The OSI reference model was devised before the protocols 
were invented. This ordering means that the model was not 
biased toward one particular set of protocols, which made 
it quite general. The down side of this ordering is that 
the designers did not have much experience with the subject 
and did not have a good idea of which functionality to put 
in which layer.
Being general,the protocols in the OSI model are better 
hidden than in the TCP/IP model and can be replaced 
relatively easily as the technology changes. 
Not so widespread as compared with TCP/IP. (complex , 
costly)
More commonly used as teaching aids.

TCP/IP
Standards adopted due to widespread use. (Internet)
The protocols came first, and the model was really just a 
description of the existing protocols. There was no problem 
with the protocols fitting the model, but it is hardly 
possible to be use to describe other models.
“Get the job done" orientation. 
	Over the years it has handled most challenges by 
growing to meet the needs.
More popular standard for internetworking for several 
reasons :
relatively simple and robust compared to alternatives such 
as OSI 
available on virtually every hardware and operating system 
platform (often free)
the protocol suite on which the Internet depends.

We all know that OSI has 7 layers and TCP/IP suite has 5 
layers. why? In TCP, we can achieve the functions of 
Session and Presentation layers in Application layer 
itself.This makes the TCP/IP protocol suite as a 5 layered. 
The functions of Session and Presentation layer are 
achieved in the Application layer with the help of 
libraries.

tcp/ip is conncetion oriented, secure , reliable and non 
proprietary routable network protocol suite that enables 
computers to communicate over all types of networks. it is 
the native protocol of the internet and is required for 
internet connectivity. and it is of 4 layers instead of 7 
of osi model.
the layers are application, transport,internet and network.
Application-TFTP protocol.
Transport-TCP, UDP
Internet-IP,ARP,ICMP,IGMP
Network-Network Interface Card

bcoz TCP\IP is a very relible and secure model and it is 
also send acknowlegment and high bandwirth

C class

class c

It must be class B if network is not design proper. It's
Flat network configuration.

In large organizations that having this much of network
equipments, should design their network with proper VLAN and
IP Subneting. This will help to cutdown network traffic and
security. It also help to resolve and minimize network
related problems.

Regards,
Kaushal Patel

Class B

I didnt get the question. Still try to answer this question.

I believe that the question is regading OSI layers.

Error Control is done ot LAYER 4 of OSI.

IP checksum calculation function will return error.

For every packet that IP receives, it calculates checksum 
and checks against the checksum value present in the 
header. If there is no match, the function returns checksum-
error and the packet will be dropped by the calling routine.

cisco swicth is property of CISCO while other switches are 
property of there own creators:)

As a matter of fact, we do know why you’re getting a Type 
Mismatch error, and it’s a common problem when working with 
the WMI class Win32_NetworkAdapterConfiguration. The line 
in your script that’s causing the problem most likely looks 
something like this:
Wscript.Echo "IP Address: " & objItem.IPAddress

So what’s the problem? Well, the IPAddress property is 
actually stored as an array; that’s because it’s possible 
for multiple IP addresses to be assigned to a single 
network adapter. You’re treating IPAddress as though it was 
a string or numeric variable and it’s not; an array is a 
totally different datatype. Hence the Type Mismatch error.