Top 100+ Network Troubleshooting Interview Questions And Answers

Question 1. Name Three Steps Which You Would Use To Troubleshoot Ftp Server Related Problems.?

Answer :

Test primary connectivity with ping, Check with nmap if the ports are open (20 and 21). Check if a firewall is restricting site visitors to the server.

Question 2. How Would You Troubleshoot Dns Problems?

Answer :

Ping the DNS server and take a look at the response. Check with wireshark if DNS request and response packets are being sent and acquired.

Network Technical Support Interview Questions
Question three. Name Three Steps Which You Would Use To Troubleshoot Internet Related Problems.?

Answer :

Check the connectivity with the default gateway. Check if the DNS server is configured at the PC. Check if the perfect port variety is energetic the usage of nmap on the DNS server.

Question 4. How Would You Troubleshoot Dhcp Server Related Issues.?

Answer :

Check the IP connectivity with the DHCP server from a system configured on the community. Test if the DHCP customer and server carrier is started on the DHCP server and the customer. Test if the DHCP server provider is on hand using nmap.

Networking Tutorial
Question 5. A User Is Unable To Telnet Into The Router. Explain The Methodology Of Troubleshooting.?

Answer :

Check the IP connectivity using ping. Check if port 23 is open on the router using nmap.

Computer Technical Support Interview Questions
Question 6. A User Is Able To Ping Ip Addresses On The Internet , But Unable To Access It Via Domain Names. Should The Dns Server Be Configured On The Gateway Or The Client.

Answer :

The DNS server may be a public server or the gateway address. If it's far the gateway address, the DNS server address ought to be configured on the gateway. The DNS server ought to additionally be configured at the users TCP/IP adapter.

Question 7. What Are The Differences Among Router, Switch And Hub?

Answer :

Hub (layer 1 Device):

Hubs, additionally known as repeaters, are network devices which can operate on layer-1 (I.E. The physical layer) to connect community devices for communique.
A commonplace connection point for gadgets in a network (Physical Layer-Layer1). When a packet arrives at one port, it's far copied to the other ports so that each one segments of the LAN can see all packets.
Switch (layer 2 Device)::

Switches are network gadgets that perform on layer-2 of OSI model of communication.
Switches also are referred to as smart hubs.
 In networks, a device that filters and forwards packets among LAN segments. Switches operate on the records hyperlink layer (layer 2) and on occasion the network layer(layer 3) of the OSI Reference Model .

Router (layer 3 Device): 

Routers are the network gadgets that operate at Layer-3 of OSI version of communication.
As layer-3 protocols have get admission to to logical deal with (IP addresses) so routers have the capability to forward statistics across networks.
Sometimes routers are also referred to as layer-three switches.
A tool that forwards records packets along networks. A router is hooked up to at least two networks, generally  LANs or WANs or a LAN and its ISP [Network Layer (Layer3)]

Linux Tutorial Networking Interview Questions
Question eight. What Are The Types Of Lan Cables Used?

Answer :

Straight Cable
Cross Cable
Question nine. What Is A Cross Cable?

Answer :

Its used to connect same form of gadgets without the use of a switch/hub so as to speak.

Linux Interview Questions
Question 10. What Could Be The Maximum Length Of The Lan Cable?

Answer :

The theoretical period is 100 meters but after eighty meters you may see drop in velocity due to lack of signal.

AWT (Abstract Window Toolkit) Tutorial
Question 11. What Would You Use To Connect Two Computers Without Using Switches?

Answer :

Cross cable.

Mac OS X TroubleShooting Interview Questions
Question 12. What Is Ipconfig Command? Why It Is Used?

Answer :

IPCONFIG command is used to show the IP records assigned to a computer.

From the output we will discover the IP deal with, DNS IP cope with, gateway IP address assigned to that laptop.

Network Technical Support Interview Questions
Question 13. What Is Apipa Ip Address? Or What Ip Address Is Assigned To The Computer When The Dhcp Server Is Not Available?

Answer :

When DHCP server is not available the Windows patron pc assignes an automatic IP address to itself so that it may communicate with the network cmputers. This ip address is called APIPA. ITs within the range of 169.254.0.Zero to 169.254.255.255

APIPA stands for Automatic private IP addressing.

Question 14. What Is A Domain? What Is The Difference Between A Domain And A Workgroup?

Answer :

Domain is created while we set up Active Directory. It's a safety boundary which is used to manage computer systems in the boundary. Domain may be used to centrally administor computer systems and we will govern them the use of not unusual rules known as institution regulations. We can't do the equal with workgroup.

Domain: Collecton of customers controlled with the aid of the server called Domain

Work Group : Colletion of Client network referred to as Work Group

Question 15. What Is Ping Utility?

Answer :

PING: Packet Internet Gropper. It's a diagnostic utility, which diagnose connectivitybetween computer systems. It use ICMP: Internet Control Messaging protocol to ship echorequests ( typically 4 packets) and acquire echo replies (four packets)

Landscape Interview Questions
Question sixteen. What Is The Difference Between Physical Address And Logical Address?

Answer :

Physical Address: It’s known as as MAC Address (forty eight bit)

Logical Address :  It’s Called as Ip Address   (IPv4 -32 bit &  IPv6 -128 bit)

Question 17. What Is The Range Of Addresses In The Classes Of Internet Addresses?

Answer :

ClassA : 1-126         N.H.H.H  1.Zero.Zero.1 to126.255.255.254    - 16 million hosts on every of 127 networks.

ClassB  : 128 -191   N.N.H.H  1 28.1.Zero.1 to191.255.255.254 - 65,000 hosts on every of sixteen,000 networks.

ClassC: 192- 223   N.N.N.H     192.Zero.1.1 to223.255.254.254 - 254 hosts on every of two million networks.

ClassD  : 224-239  - Reserved for multicast businesses.

ClassE:  240-254   - Reserved for future use.

Ranges 127.X.X.X are reserved for loopback or neighborhood host

Range of 169.254.X.X is APIPA, stands for computerized non-public IP addressing

Firewall Support Interview Questions
Question 18. What Is The Difference Between Public And Private Ip Addresses?

Answer :

Public IP addresses:

A public IP deal with is any legitimate cope with, or number, that may be accessed over the Internet.  Internet requirements businesses, consisting of the Network Information Center (NIC) or the Internet Assigned Numbers Authority (IANA), are the agencies answerable for registering IP levels and assigning them to businesses, such as Internet Service Providers (ISPs).

Private IP addresses:

A personal IP address is any number or deal with assigned to a tool on a personal TCP/IP Local Area Network this is reachable handiest in the Local Area Network.  For a useful resource inside the Local Area Network to be available over the Internet, a tool within the Local Area Network must be related to the Internet with a public IP address, and the networking ought to be as it should be configured. 

The same Internet standards businesses have reserved the subsequent 3 IP deal with tiers in order to never be registered publicly:

First IP in block Last IP in block

10.0.0.Zero 10.255.255.255

172.Sixteen.Zero.Zero 172.31.255.255

192.168.Zero.0 192.168.255.255

Computer Technical Support Interview Questions
Question 19. Crimping Types & Colour Coding?

Answer :

1.Straight Crimping  : Communication  bw the  Difference Devices 

   Ex.( System To Switch &  Switch to System or Modem)

 2.Cross Crimping : Communication  bw the  identical Devices    

 Ex.( System To gadget &  Switch to replace)

Straight:

Orange white  orange Orange white  orange
Green white    blue Green white    blue
Blue white       green Blue white       green
Brown white   Brown Brown white   Brown
Crosss:

Orange white  orange Green white  Green
Green white    blue Orange white    blue
Blue white       inexperienced Blue white      Orange
Brown white   Brown Brown white   Brown
Question 20. What Is A Gateway?

Answer :

A default gateway is a routing tool used to ahead all visitors that isn't addressed to a vacation spot in the neighborhood community or nearby subnet. If you don’t have a default gateway, it isn't always viable to communicate with the network tool/host of different networks.

Desktop Support Interview Questions
Question 21. What Is Subnet Mask?

Answer :

Subnet mask is used for identify the Network.

Example:

For a category A address,  a general subnet mask is 255.0.0.Zero,

For a category B deal with,  a preferred subnet mask is 255.255.Zero.0,

For a class C cope with,  a popular subnet masks is 255.255.255.Zero.