30 Top Interview Questions of Network Engineer

Fig 1 : 30 Top Interview Questions of Network Engineer

1) What is the first product of the Cisco ?

In the year of 1985 the cisco company sold it first product and that first product was "Network Interface Card" that NIC cards for the digital equipment corporation's computer.

2) What is networking ?

Networking is defined as the "connectivity of two or more devices so that they can communicate with each other".

3) Why we need networking ?

Following are the reasons of we need networking :

• Information sharing
• File Sharing 
• Resource Sharing

4) What is difference between the 568A and 568B ?

568B is the standard of ethernet cable for the different types of devices. Here below is the sequence of colors wires of the 568B standard:

1. Light Orange                   tx+
2. Orange                             tx-
3. Light Green                     Rx+
4. Blue                                 unused
5. Light Blue                       unused
6. Green                               Rx-
7. Light Brown                    unused
8. Brown                              unused

568A is the standard in which the sequence of the colors wires:

1. Light Green                     tx+
2. Green                               tx-
3. Light Orange                   Rx+
4. Blue                                 unused
5. Light Blue                       unused
6. Orange                             Rx-
7. Light Brown                    unused
8. Brown                              unused

5) What is the bandwidth of the 1000BASE-T and IEEE name ?

The bandwidth of this 1000BASE-T is 1000 Mbps and the IEEE name is 802.3ab.

6) What are the five vendors of networking Devices ?

Following are the vendors of the networking devices :

1. Cisco
2. Huawei
3. Juniper 
4. HP
5. Dell

7) In which year OSI model was released ?

In 1984 International Organization for standardization published the Open System Interconnection model.

8) What are the responsibilities of the application layer ?

Following are the responsibilities of the application layer :

• It deals with the presentation of the data.
• Encoding-Decoding
• Encryption-Decryption
• Compression-Decompression

9) What is the session ID ?

Session id is the id that is used for identification of session between source and the destination.

10) What is FTP ?

FTP stands for the file transfer protocol which is use for the transferring of files form one computer to an other computer and ftp allow access to files and also access to directories. FTP is the slow protocol because of the TCP.

11) What is SNMP ?

SNMP stands for the simple network management protocol and it is used for enabling the central management of network. Simple network management protocol work with the TCP/IP and it uses the UDP for the transportation of the data.

12) What are the major functions of the transport layer ?

• Transport layer is used for the identification of the service.
• Transport layer is used for the multiplexing and demultiplexing.
• Transport layer is used for the segmentation.
• Transport layer is used for the sequencing and reassembling.
• Transport layer is used for the error correction and flow control.

13) What is the value of the MTU ?

MTU stands for the maximum transmission unit and the value of MTU is 1500 bytes.

14) What is difference between routing protocols and routed protocols ?

Routing Protocol are the protocols that are used for the path determination.

eg: OSPF, EIGRP, ISIS

Routed Protocols are the protocols that are used as a data carrier.

eg: IP, IPX, AppleTalk

15) What is the range of the multicasting address in IPv4 ?

The range of the multicasting address in IPv4 is 224-239.

16) Who is responsible for the global coordination of the internet protocol addressing system ?

Internet Assigned Name And Authority (IANA).

17) What are the layers that are responsible for the data flow ?

Following are the layers that are responsible for the data flow in a network:

• Physical Layer
• Datalink Layer
• Network Layer

18) What are the types of the transmission ?

There are the three types of transmission:

• Unicast            one to one
• Multicast         one to specific group
• Broadcast        one to everyone

19) Is switch a unicast device ?

Switch is the broadcasting device and it is the broadcasting device till the time its switching table not complete and when it's table complete it become the unicasting device.

20) What is the CAPWAP tunnel ? 

CAPWAP is stands for the control and provisioning of wireless access point CAPWAP tunnel is the tunnel which is create between the controller and the light weight access point.

21) What is the NIC ?

NIC stands for the network interface card it is card that is company install in the device without this card we don't able to connect to the internet.

22) Convert 200.100.150.100 address into the binary form ?

11001000.01100100.10010110.01100100

23) What are the OSPF special area types ?

Backbone Area 

• Area 0 is the backbone area.

Non-Backbone Area

Others areas types are following :

• Stub Area
• Totally Stub Area
• NSSA (Not so stubby area)
• Totally NSSA

24) What is the AD value of ISIS and what is the preference  value of ISIS ?

The AD value of ISIS is 115 and the AD value in Huawei is called the preference the preference value of ISIS is 15.

25) What are the features of ISIS ?

Following are the features of ISIS protocol that stands for intermediate system to intermediate system:

• Designed for the large scale network.
• ISIS convergence time is very fast.
• Support the classful and classless Routing
• Easy to configure than the Open Shortest Path First.

26) What are the backbone router in ISIS ?

Level 2 router in the ISIS is known as the backbone router. It create the level 2 link state database.

27) Routing is done on the basis of destination address if we want to do routing on the basis of source address what should we do ?

If we want to do routing on the basis of the source address we should have to do the policy based routing and policy based routing will be done with the help of the access list/prefix list.

28) How many VLANs exist by default ? 

1. VLAN 1: It is the VALN that active by default all the ports are the members of this.
2. VLAN 1002: It is the VALN that active by default and it is used for the fddi-default.
3. VLAN 1003: It is the VALN that active by default and it is used for the token-ring-default.
4. VLAN 1004: It is the VALN that active by default and it is used for the fddinet-default.
5. VALN 1005: It is the VALN that active by default and it is used for the trnet-default.

29) What is autonomous system ?

Autonomous system is the large network that is the collection of the multiple network.

30) What is administrative value of EBGP and IBGP ? 

The administrative value of EBGP is 20.

The administrative value of IBGP is 200.