Network Engineer Interview Questions

Interview Questions :

1.  Tell about yourself ?

2.  What is the recent incident you faced in your job and how you troubleshoot ?

3.  Can you explain about OSI layers ?

4.  Can you brief the functions of each layers ?

5.  What are the protocols used in each layers ?

6.  What do you mean by routed and routing protocols ?

7.  Can you define link state routing and distance vector routing protocol with examples ?

8.  what is the difference between rip v1 and rip v2 ?

9.  How a neighbor is confirmed in EIGRP ?

10. In eigrp how a router informs that his neighbor is down to other routers ?

11. what is mean by stuck in active ?

12.  How will you clear a route which is in stuck in active state ?

13. what is mean by feassible successor and feasible distance ?

14. can you tell the metric calculation formula in EIGRP ?

15.  What is the difference between EIGRP and OSPF ?

16.  What is the metric used in OSPF and how it is calculated ?

17.  Explain about areas in OSPF ?

18. What is the difference between STUB , NSSA ,and TOTALLY STUB area of OSPF?

19.  what is mean by virtual-link and how many areas can  a virtual link pass ?

20.  How router id is selected in OSPF ?

21. Can we manually set router id , and how it affect the topology ?

22.  Which switch models you worked ?
23.  What is the difference between Cisco 4507 and Cisco 4507 E ?
24.  How data packets are switched in layer 2 ?

Interview Questions with Cisco for post of Network Engineer

Interview Questions with Cisco:-

Hi folks recently i have attended interview with cisco for the post of Network Engineer . So i would like to post the interview questions in by blog. I hope this post will be helpfull for those who are preparing for interview .

   1.        Tell about your job profile ?

   2.       Explain about OSI layers ?

   3.       Do we use OSI layers now ? 

   4.       Explain about ARP works?

   5.       Scenario 1 : Explain how communication between PCA and PCB happens ?

   6.       What is the difference between OSI layer and TCP/IP Protocol?

   7.       What is the difference between TCP and IP ?

   8.       How much you know about RIP ?

   9.       What are the difference between RIPv1 and RIP v2?

   10.   Whether auto-summarisation is enable by default in RIP ? 

   11.   How auto-summarization works ?

   12.   Scenario 2 : How auto summarization works in this topology?

   13.   What do you mean by static routing and Default Static routing?

   14.   What do you mean by routed protocols and routing protocols ?

   15.   What is mean by AD value and Metric Value ?

   16.   How much you know about EIGRP ?

   17.   What is mean by Stuck in Active in EIGRP ?

   18.   What is the method to avoid Stuck  in active state ?

   19.   What is mean by Fessiable Successor ?

   20.   Whether it is possible to have two routes with for same destination ?

   21.   How much you know about OSPF ?

   22.   Explain how OSPF protocol works ?

   23.   How much you know about BGP?

   24.   How HSRP works ?

   25.   How STP protocol works ?

   26.   How is Root bridge is elected ?

   27.   What is the method to manually elect the root bridge?

   28.   What type of NAT you used in ASA firewall ?

   29.   What is the difference between Static Nat, Dynamic Nat and Policy Nat ?

   30.   You are worked in Cisco 6509 catalyst switch , so what is the supervisor engine model supported in Cisco 6509 switch ?

   31.   What type of redundancy you configured in Supervisor engine of your switch ?

   32.   What is mean by SSO mode ?

Cognizant - Interview Questions for Network Admin

Dear all,
       I have attended interview for the post of Network Admin on 31st August 2013. I would like the share the experience with you , that's why i am posting the list of interview questions asked to me.

I am just posting just the technical questions alone

1. What is mean by stuck in active in EIGRP ? 
2. What is mean by Feasible Sucessor ?
3. What  is it located ?
4. What are the metrics used in EIGRP ?
5. What are the default values of Metric ?
6. What is the Multicast address used in EIGRP ?
7. What do you mean by unequal cost load balancing ?
8. what is the formula to calculate metric ?
9. what is the condition for feasible distance ?
10. next come to OSPF , What do you mean by LSA in OSPF ?
11. What are the different states in OSPF ?
12. when will the database description packet gets exchanged ?
13. what are the contents in database description packet  ?
14. What do you mean by Type 6 LSA ?
15. In a site to site vpn how many phases are there ?
16. What are the parameters of Phase 1 ?
17. If the authentication method in phase 1 mismatch ,how will you identify ?
18. How will check the configured Access-List is working or not ?
19. What is the use of having Security Zones in ASA Firewall ?
20. What are the parameters you will check if i cannot able to communicate from inside  n/w to outside n/w through the ASA firewall ?
21. How will you check whether NAT is happening or not ?

Differnce Between HSRP and VRRP Protocol

 I hope this blog will be usefull to those who want to understand the difference between HSRP and VRRP.Both the protocols are widely used by Network professional to achieve gateway load-balancing .The More about these protocols are listed below.

HSRP :
->  HSRP stands for Hot Standby Routing Protocol
->  Cisco Properiotity Protocol
->  Preempt is diabled by default
->  HSRP Router terms Active Router, Standby Router

VRRP :
->  VRRP stands for Virtual Router Redundancy Protocol
->  Open Standard Protocol
->  Preempt is enable by default
->  VRRP Router terms Master Router, Backup Router

Dell Sonicwall - Interview Questions

Hi readers ,
     This time i would like to share another interview experience of mine in my blog

Company Name -  Dell Sonicwall
Job Title             -   Network Security Engineer
Work Location   -  Chennai
Interview Mode  -  Telephonic

1. Can you explain about you , your educational background and Technical Background ?
2. Explain about DHCP process ?
3. What is the use of ARP Protocol ?
4. scenario -  There are two brand new systems with windows seven operating system .In one of the system      
    i have created a file and saved it to the desktop. Now my question is what are the minimum software and  
    hardware requirments required for me to get the file in another system.
5. What do you mean by proxy ARP ?
6. What is mean by SSL Handshake ?
7. what is the difference between STP and RSTP ?
8. Can you explain about VPN ?
9.  What is mean by TCP Handshake ?
10. what is mean by iterative query ?
11. Scenario -  In a router there are two routing protocol EIGRP and OSPF , by default the router will
      choose which route .

Syntel Corportion - Network Engineer Interview questions

Hi , i have attended Telephonic interview last week for Information Security Domain in Syntel Corporation, chennai . So i want to share my experience because i think it may be helpful to those who are searching job.

The questions i was asked during the interview are

1. The common question in all the interviews is " Tell about yourself ?"
2. Difference b/w Router and Firewall ?
3. Whether Firewall can able to terminate the network ?
3. Difference b/w the access-list in the router and Firewall ?
4. What is the port number used by Ping Command ?
5. Can you explain about the media layer in OSI model ?
6. How DHCP Works ?
7. what is the purpose of SRV Records in DNS ?
8. Router and Firewall works in which layer of OSI model ?
9. What is the use of NSLOOKUP command ?
10. what is the difference between AD in windows server 2003 and 2008 ( interms of security side)
11. What are the things you will observer , if you are asked to do firewall auditing ?
12. How will you contribute yourself to Information Security ?
13. Tell some commands you used for troubleshooting in windows or linux environment ?

Dynamic Routing Protocol :

1. RIP
2. IGRP
3. EIGRP
4. OSPF
5. BGP

RIP :
   Routing Information Protocol is a true distance vector Routing protocol which sends complete routing table  to its neighbours over a periodic time of 30 seconds. RIP is a broadcasting protocol. The maximum HOP count is 15 which means that RIP protocol will not suitable for a network where the no of router exceeds 16.
RIP protocol comes in two versions

1. RIP v1
2. RIP v2


Dear Readers kindly post your valuable suggestions and comments below which will initiate me to make this blog with more information.

BGP ( Border gateway Protocol )

             The Border Gateway Protocol is the routing protocol of the Internet. Actually internet is comprised of Many Autonomous Systems ( AS ).BGP’s task is to maintain lists of efficient paths between ASes.


             A set of computers and routers under a single administration, such as a university or company network, is known as an autonomous system (AS)

How BGP Works : 

      

             BGP Works by Establishing a Network Connection with another BGP Router using TCP 
protocol on port no 179. Once the connection is established between two routers then those routers are said to be BGP Neighbours. 

            After BGP peering finishes then two routers will exchange their Routing Information eachother and each router will buid up their forwarding information base based on Routing Information base and local policy rules.

            Each AS will have many routers for internal communication, and one or more routers for communications outside the local network.Internal routers use internal BGP (iBGP) to communicate with each other, and external routers use external BGP (eBGP). (iBGP and eBGP are the same protocol, but use different routing rules; iBGP does not advertise third-party, outside routes.)

The BGP standard defines four message types:
•  OPEN
•  UPDATE
•  NOTIFICATION
•  KEEPALIVE.

OPEN Message Format :

Field	Length (bytes)
BGP version	1
Autonomous system number	2
Hold time	2
BGP identifier (IP address)	4
Optional parameters length	1
Optional parameters	variable: 0..255 bytes

UPDATE Message Format

Field	Length (bytes)
Withdrawn routes length	2
Withdrawn routes	variable
Path attributes length	2
Path attributes	variable
Network layer reachability information	variable

Dear Readers kindly post your valuable suggestions and comments below which will initiate me to make this blog with more information.