TOP 10 NOC Network Engineer Interview Q&A

TOP 10 NOC NETWORK ENGINEER INTERVIEW Q & A

1) Tell us something about yourself ?

Answer-

It's the most important question.
Give a short personal description.
Tell about your skill set and domain.
Talk about the your current and previous work experience.
Tell something about the challenges faced and achievement achieved so far.
Try to just convince the Interviewer how your skill set matches the job requirements (it's important to go through the Job Description).
Don't lie to the Interviewer.

2)How to find the uptime in Cisco Router ?

Answer-

By using the command -
#sh version

3)Where & When would you use "ipconfig" command ?

Answer-

"ipconfig" command is used on computer to find out the IP address , Gateway IP address assigned , DNS IP address assigned to the computer.

4)What is TCP 3 Way Handshake ? 

Answer-

To establish a connection, TCP uses 3 way Handshake.

3 Way Handshake is nothing but the 3 Steps required to form TCP Connection.

1) SYN  - Client initiates the connection by sending TCP SYN packet to destination Server.

The packet contains random sequence number (for e.g 6545)

2) SYN-ACK - The Server receives the packet and responds with SYN- ACK .

This response will contain SYN with its own sequence number(for eg. 6801) and ACK number which is Client's sequence number incremented by 1 (here e.g. 6546)

3)ACK- The client acknowldge the response from Server by sending the acknowledge number which is Server's sequence number increment by 1.(here.6802)

5)How can you check the connectivity between a source and destination server ?

Answer-

By using ping and traceroute from Source Server to the Destination Server.

6)What is proxy server and benefits of using proxy server ?

Answer-

Proxy server  is a server that acts as an intermediary for the requests from client seeking resources of the other servers.
Client connects to the proxy server requesting for some services available on the different server & Servers also reply back to client through the proxy server .
Benefits -
Logs are captured and saved for the request and responses from client and server .
Using Proxy servers the client hide behind the Proxy server and anonymously access the services of the desired servers which adds to the security of the clients.
Using Proxy servers an network administrator would get more control on the access of the clients request to the server.
Clients can access restricted servers/services using proxy server.

7)How to check a Router's utilization and also check the current processes on Router ?

Answer-

We can check a Router's utilization by using command
#sh processes cpu history
We can also check the processes which are shooting up the cpu utilization
#sh processes cpu sorted 

8) What is the criteria for path selection of the Router?

Answer-

Longest Prefix Match
Minimum AD Value
Best metric Value

9) How to make a L2 Switch accessible remotely ?

Answer-

By taking console of the L2 Switch -
We need to create an SVI or Management vlan on the L2 switch.
Configure a default gateway,
Enable ssh / telnet on the device .
Then by using any third party tool like putty or teraterm we can access the switch by using the Management vlan IP address.

10) Why we should hire you as NOC engineer ?

Answer-

To answer this question you should have a good understanding of Job Description.
You may not have much experience or skills as compared to others appearing for the interview.
But while answering you should show a lot confidence , energy and passion.
Try to explain how you are compatible with the Job Description .

Hope you all find the post useful .

You can write me on - amar.techstuff@gmail.com

Thanks for reading