All Technical Interview Questions & Answers

Network Administrator Interview Questions with Answers!!!

2011-03-16T05:44:00.001-07:00

1.What is a NIC?
Network Interface Card

2.What is a MAC Address?
MAC- Media Access Control .its a unique identifier defined for certain hardware/network adapters

3.When would you use a crosslink cable?
To link computers using this cable..You need to assign the static Ip if u need to

4.What are the main advantages and disadvantages of Fiber-Optic-based networks?
Adv:More efficient and quality of service is better.
Dis: Expensive, complicated

5.What is the difference between a Hub and a Switch?
Hub is device to connect two devices, switch is a network bridge which processes and routes data approirately over network layer of OSI Reference model

6.On which OSI layer can a router be found?
physical layer

7.What is CSMA/CD?
Carrier sense multiple access with collision detection

8.What is multicast?
to send data/info to group of computers using same network

9.What is Broadcast?
TO send data/info to all of the members of the network..( simple 176.16.255.255 for class B network)

10.What is the difference between TCP and UDP?
TCP-Transmission Control Protocol
UDP- user Datagram protocol

UDP is user assisted program and converts the application into the encapsulated form and makes it end point for data to send and then TCP helps in transmission or broadcast!

11.Describe some of the settings that are added by TCP and by UDP to the packet's header.

ans:Its called Encapsulation

12.What are TCP Ports? Name a few.
As described above End points are called Ports.
5/TCP,UDP Remote Job Entry
7/TCP,UDP Echo

13.What is a TCP Session?
the layer that establishes ,manages and terminates the session between two communticating devices

14.What three elements make up a socket?

Protocol (TCP, UDP or raw IP).
Local socket address (Local IP address and port number)
Remote socket address

15.What will happen if you leave the default gateway information empty while manually configuring TCP/IP?
i think it will automatically get it from DNS server

16.What will happen if you execute the following command: "arp –d *"?
- deletes all the ip address information

17.What is ICMP?
Internet Control Message Protocol

18.When would you use the ping command with the "-t" switch?
to get the ping back from other computer with no packet loss

19.What command-line tool would help you discover for which port numbers your computer is listening?
netstat -n (on Dos prompt)

20.What is APIPA? How would you recognize it?
Automatic Private IP Addressing
for small network if u see something default automatic numeric values entered in a device that is attached you can see someone novice has done that using APIPA

21.What is a Cyclic Redundancy Check?
its a function that checks the input data value/length and than produces the output usualy of integral of 32 bits

22.What would you type in at a command prompt to view the IP settings for the computer that you are sitting at?
"ipconfig"

23.What command would you type in at a command prompt to view the IP address of the remote computer?
Ping
Netstat

24.What is the W Value for class B?

25.What is the Net ID of an IP Address of 18.9.25.3 with Subnet Mask of 255.0.0.0?
CLASS A network with NET ID 18.0.0.0

26.What is CIDR?
Classless Inter-Domain Routing

27.What is 255.255.255.255 used for?
Research

28.What is the maximum number of hosts for a Class B Network?
16384 (2(raise to power N)- 2)

29.What is the (default) class type of 195.152.12.1?
CLASS B with NET ID 195.152.0.0

30.What is the subnet mask for 10.0.10.1/17?
255.0.0.0

31.What is the result when changing from a subnet mask of 255.255.224.0 to a subnet mask of 255.255.240.0?
hmm..broadcast and binary address changes i guess

32.How can you access a shared folder from a remote computer? Name at least 3 methods.
-from ur pc my network place
- using a mapped drive
-Universal Naming Convention (UNC)

List of computing and IT abbreviations

2011-03-10T05:35:00.000-08:00

UNC Universal Naming Convention

\\servername\shared name (It is used to access the shared folder)

MAC Media Access Control

PDC Primary Domain Controllers

BDC Backup Domain Controllers

SMP Symmetric Multi Processors

AMP Asymmetric Multi Processing

EFS Encrypted File System

FAT File Allocation Table

HCL Hardware Compatibility List

IIS Internet Information Service

LSA Local Security Authority

MMC Microsoft Management Console

OU Organizational Unit

RAS Remote Access Service

RDP Remote Desktop Protocol (used for Terminal Services)

RRAS Routing and Remote Access Service

SID Security Identifier

WINS Windows Internet Name Service

GUID Globally Unique identifier

IAS Internet Authentication Service

UPN User Principle Name (Username@domainname.com)

BIOS Basic Input Output System

Net BIOS Network Basic Input/Output System

ARP Address Resolution Protocol

DVD Digital Video Disk

GPO Group Policy Object (LGPO Local Group Policy Object)

IPsec Internet Protocol Security

ISP Internet Service Provider

NAT Network Address Translation

MBT Master Boot Record

USB Universal Serial Bus

POST Power On Self Test

SCSI Small Computer System Interface

SMTP Simple Mail Transfer Protocol

URL Uniform Resource Locator

RAID Redundant Array of Independent Disk

IDE Intelligent drive Electronics or Integrated Drive Electronics

FQDN Fully Qualified Domain Name (full computer name) [computername.domainname.com]

OSPF Open Shortest Path First (these two are routing protocols)

RIP Routing Information Protocol

POP3 Post Office Protocol (used to receive the mails)

SMTP Simple Mail Transfer Protocol (Used to send the mails)

SMPS Switch Mode Power Supply

PING Packet Internet Groper

VNC Virtual Network Computing

EULA End User License Agreement

CAL Client Access License

TSCAL Terminal Services Client Access License

UPS Uninterruptible Power Supply

BIND Berkeley Internet Name Domain

PXE Pre boot eXecutable Environment

UDF Uniqueness Database file

LDAP Light weight Directory Access Protocol

ISDN Integrated Services Digital Network

VLSM Variable Length Subnet Mask

CIDR Classless Inter Domain Routing

IGMP Internet Group Management Protocol

FSMO Flexible Single Master Operations

APIPA Automatic IP addressing

NetBEUI Net Bios Enhanced User Interface

UDP User Datagram Protocol

FTP File Transfer Protocol

Mbps Mega bits per second

Ntds.dit Nt directory services.directory information tree.

ICMP Internet Control message Protocol

IGMP Internet group Management Protocol

NNTP Network News Transfer Protocol

RADIUS Remote Authentication Dial In User service

SNMP Simple Network Management protocol

VPN Virtual Private Network

L2TP Layer2 Tunneling Protocol

PPTP Point to Point Tunneling Protocol

ADSI Active Directory Service Interfaces

SUS Software Update Service

SMS System Management Service

WUS Windows Update service

TFTP Trivial File Transfer Protocol

List of important port numbers

2011-03-10T05:30:00.001-08:00

List of important port numbers

15 è Netstat

21 è FTP

23 è Telnet

25 è SMTP

42 è WINS

53 è DNS

67 è Bootp

68 è DHCP

80 è HTTP

88 è Kerberos

101 è HOSTNAME

110 è POP3

119 è NNTP

123 è NTP (Network time protocol)

139 è NetBIOS

161 è SNMP

180 è RIS

389 è LDAP (Lightweight Directory Access Protocol)

443 è HTTPS (HTTP over SSL/TLS)

520 è RIP

79 è FINGER

37 è Time

3389 è Terminal services

443      è        SSL (https) (http protocol over TLS/SSL)
220      è        IMAP3
3268    è        AD Global Catalog
3269    è        AD Global Catalog over SSL
500      è        Internet Key Exchange, IKE (IPSec) (UDP 500)