Networking Interview Questions

[satish23]

how should i choose a port number for my server?

Networking

* How can I make my server a daemon?


* How should I choose a port number for my server?


* Layers in TCP/IP


* How can I be sure that a UDP message is received?


* How to get IP header of a UDP message


* Writing UDP/SOCK_DGRAM applications


* How many bytes in an IPX network address?


* What is the difference between MUTEX and Semaphore?


* What is priority inversion?


* Different Solutions to dining philosophers problem.


* What is a message queue?


* Questions on Shared Memory.


* What is DHCP?


* Working of ping, telnet, gopher.


* Can I connect two computers to internet using same line ?


* Why networks are layered ? What is the advantage of that ?



* User(s) are complaining of delays when using the network. What would you do?


* What are some of the problems associated with operating a switched LAN?


* Name some of the ways of combining TCP/IP traffic and SNA traffic over the same link.


* What sort of cabling is suitable for Fast Ethernet protocols?


* What is a Class D IP address?


* Why do I sometimes lose a server's address when using more than one server?


* What is Firewall?


* How do I monitor the activity of sockets?


* How would I put my socket in non-blocking mode?


* What are RAW sockets?


* What is the role of TCP protocol and IP protocol.


* What is UDP?

* How many layers are there in OSI ? Why is it called OSI model ?


* network topologies ?


* Which are the different network topologies ?


* an example of bus type network.


* What is the Bandwidth of Ethernet ?


* Explain the advantage and disadvantage of Ethernet ?


* Which is the protocol used in Ethernet. (CSMA/CD) Why is it called so ?


* What is the advantage of Ring network ?


* Compare it with Ethernet.

 

[Abo Saker]

how should i choose a port number for my server

I will answer some of your questions, you can answer the other through WiKi, it will help you better than me.


* Layers in TCP/IP

4 layers: Application + Transport + Internet + host-to-network

* How can I be sure that a UDP message is received?

I think this is a trick question: you can't make sure that UDP packet arrived because it didn't transmit any acknowledgment about reciving transmitting packet like TCP, you should go to the other end to make sure your packet recieved.

* Can I connect two computers to internet using same line ?

Yes, you can connect the two computers through Cross-Cable, connect on of them to the internet and made the modem of that Computer shared though ICS (Internet Connection Sharing).

* Why networks are layered ? What is the advantage of that ?

Read about IOS Model

* User(s) are complaining of delays when using the network. What would you do?

Check their connectivity between users and your resources, maybe there is HUB causing high collision or you are using only 10Mb port speed or there is a high broadcast traffic in your network because you are using only HUB and Switches instead or router or VLAN.

* What are some of the problems associated with operating a switched LAN?

Read about VLAN
Broudcast traffic will be heard among all users and you can't manage or secure your LAN's like VLAN.

* What sort of cabling is suitable for Fast Ethernet protocols?

Cat5 Cat6 Cat7


* Why do I sometimes lose a server's address when using more than one server?

Your question is not clear.
Do you mean "when using more than one server" using more than one DNS server, in that case maybe the entry between the DNS Servers were not updated yet, in that case you may lose your server's address.

* How many layers are there in OSI ? Why is it called OSI model ?

7 layers


Regards,

 

[e_ravikumarshinde]

vlan interview questions

* How should I choose a port number for my server?
>>if you are using layer4 searvices then each stnadard protocal like FTP,HTTP,TELNEThas fixed port no.

* How to get IP header of a UDP message
UDP is L4 protocol & IP is L3 . so when you recive UDP packet, IP header will be present before UDP header & after ethernet type if field

* What is DHCP?
DHCP is dynamic Host control protocol. Which is used for automatically updating info abt IP add subnet add etc

* Can I connect two computers to internet using same line ?

Using bus topology ?

* User(s) are complaining of delays when using the network. What would you do?
proper network design

* What is the role of TCP protocol and IP protocol.
read L3 & L4 in OSI

 

[keyvan]

thanks very much

 

[JacobChristy]

Hi,
its not possible to acknowledge that whether the UDP message has been recieved on the other hand or not. This is the disadvantage of UDP

 

[ks1009]

Definitive guide to basic network stuff for interviews:

**broken link removed**

Than to rainbow9810 and the folks at Sadikhov!!!

 

[johnterry807]

Hi,
I am also very interested in this subject, but the reference is very limited. You can share documents as well as experience? Thanks!

 

[johnterry807]

I found some references on this subject, please refer to everyone here: Networking interview questions
Best regards.

 

[sapna.dudani@gmail.com]

Networking Interview Questions and Answers
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hope these links prove to be of help...........