Interview Questions.

Question 1. How Many Ips We Can Assign To A Particular Pc?

Answer :

usually u can assigh one ip, if u ant to assign multiple ip , then u use diff LAN card(outside lan card)  

Question 2. Describe A three-manner Tcp/ip Handshake?

Answer :

To set up a connection, TCP makes use of a 3-way handshake. Before a customer attempts to connect to a server, the server ought to first bind to a port to open it up for connections: that is known as a passive open. Once the passive open is established then a patron might also provoke an lively open.

To establish a connection, the three-way (or three-step) handshake takes place:

The lively open is completed with the aid of sending a SYN to the server.
In response, the server replies with a SYN-ACK.
Finally the client sends an ACK back to the server.
At this point, each the patron and server have received an acknowledgement of the relationship.

When we want to connect with server for communication we want to establish a connection among server and customer. The method used for that is referred to as three-way handshake...That is defined as follows

Initillay the server is prepared to accept the incoming connection by way of binding to local port. This is referred to as passive open.
The consumer now can hook up with server by means of sending SYN J segment to server. The server responds with SYN J+1 and ACK K
At the quit the purchaser sends ACK K+1 to server..
At this stage we say that purchaser and server are linked

Computer Network Security Interview Questions
Question 3. What Is Difference Between Dial-up Internet Connection And Broadband Connection?

Answer :

Dial up connection requires a username/password & a modem to connect to net.The maximum speed can be of 56kbps handiest. In this both the phone or the net will work at a time.

While in broadband connection (it want a modem & might also need person/password).It is immediately connected with RJ45 LAN card. Its speed degrees from 256kbps to several mbps. In this both telephone line and internet can paintings collectively.

Question 4. What Is The Difference Between Hub,switch And Router?

Answer :

HUB When Ethernet became originally designed it used a single fats coax referred to as a spine. Individual hosts have been physically connected to the backbone. This created a party line. Each host has to pay attention for the spine to be idle earlier than it started speakme. It is feasible extra then one host will begin talking at the equal time, in that case the messages collide making them unintelligible. This condition is detected each transmitter stops speaking and waits a variable interval earlier than attempting to talk once more. The Ethernet community is known as a collision domain, in view that all devices must wait until the line is obvious, and may inadvertently interfere with each other.

When Ethernet become changed to run over Unshielded Twisted Pair (UTP) Category rated wiring the unique coax backbone become gotten smaller within the hub, called a collapsed spine. Functionally a hub operates exactly as the old coax backbone. The ports on the hub offer a factor-to-factor connection to the Ethernet interface in every pc. With a hub every node need to anticipate the network to be idle and stumble on collisions between more than one nodes.

SWITCH As Ethernet networks grew in pace and length the birthday celebration line nature turned into diagnosed as a overall performance quandary. Switches cast off the collision domain and paintings just like the phone switching gadget.

When an Ethernet packet arrives on the transfer the vacation spot MAC deal with is examined and the packet is switched to the proper port. Each Ethernet interface has a Media Access Controller (MAC) forty eight-bit cope with assigned with the aid of the hardware supplier. The switch recalls which MAC addresses are linked to every port. If the Switch does now not realize which port to use it floods the packet to all ports. When it receives a response it updates its internal MAC cope with table.

This way Port A can communicate to C on the equal time F is taking to B. This significantly will increase universal overall performance even though it does now not trade the speed of man or woman connections. Because the collision domain is removed connections are able to use full duplex, hosts can transmit and receive at the equal time improving overall performance even greater.

ROUTER A router is used to interconnect a couple of networks. The Internet is literally Internetwork -- a community of networks. Internet router's paintings on IP addresses to determine how best to interconnect the sender to the destination. Because router's paintings on the IP layer one-of-a-kind physicalnetworks can be interconnected, Ethernet, Token Ring, Sonet, even RS232 serial used for dialup can deliver IP packets.

Routers supposed for home use consist of Network Address Translation (NAT). This allows a single cope with assigned with the aid of the ISP to be shared by means of multiple hosts linked to the neighborhood community.

Question 5. Under What Situations A Packet Can Go Into Infinite Loop In A Network?

Answer :

if there are more than one manner for accomplishing a selected router from the same source router.

If TTL(time to live)field become 0.
Invalid vacation spot.
If any fragment is lost.
Hardware and Networking Interview Questions
Question 6. What Is Metropolitan Area Networks?

Answer :

A MAN is optimized for a bigger geographical vicinity than a LAN, starting from numerous blocks of homes to complete cities. MANs also can depend on communications channels of slight-to-excessive records fees. A MAN might be owned and operated by way of a single company, however it typically can be used by many people and organizations. 

Question 7. What Are The Difference Between Node,host,terminal,gadget,hub?

Answer :

These are all various things in networking:

Hub:Where we connect all of the the hyperlinks for a networking connection.

Node:It can be diagnosed as a one connection.

Host:is nothing than if you are going to send a request to the server the wondered system can be know as a number.

LAN Interview Questions
Question eight. What Is Mean By Dns(domain Name System)and What Is The Purpose Of It?

Answer :

DNS is referred to as area name server.It is used to resolved the ip address to domain call or vise versa.

Question nine. What Is Proxy Arp?

Answer :

It is using a router to reply ARP requests. This might be done whilst the originating host believes that a destination is nearby, while in truth is lies beyond router.

Proxy ARP (Address Resolution Protocol) is a technique through which a device on a given network answers the ARP queries for a community cope with that is not on that community. The ARP Proxy is privy to the region of the visitors's vacation spot, and gives its own MAC deal with in reply, efficaciously announcing, "send it to me, and I'll get it to where it desires to move." Serving as an ARP Proxy for every other host efficaciously directs LAN visitors to the Proxy. The "captured" visitors is then usually routed via the Proxy to the supposed vacation spot thru some other interface

CWNA (Certified Wireless Network Administrator) Interview Questions
Question 10. What Is Passive Topology?

Answer :

When the computer systems on the network truely pay attention and obtain the sign, they are called passive due to the fact they don’t amplify the sign in any way.

Example for passive topology: linear bus.