1⟩ Explain what is a Multi-homed Host?
If more than one NICs (Network Interface Card/ Network Adapter) are installed having different IP Addresses onto it, The Pc Becomes a Multihomed Host.
Computer Networks
Home Networking Computer Networks
“Computer Networking related job interview questions and answers guide. Lean Computer Networks and get preparation for the job of Computer Networking field”
210 Computer Networks Questions And Answers
2⟩ Tell me what is OSPF?
It is an Internet routing protocol that scales well, can route traffic along multiple paths, and uses knowledge of an Internet's topology to make accurate routing decisions.
3⟩ Explain why WINS server is required?
Windows Internet Naming Service (WINS) is an older network service (a protocol) that takes computer names as input and returns the numeric IP address of the computer with that name or vice versa. WINS was designed to replace the LMHOSTS file functionality that was used previously on computers and networks utilizing NetBIOS and NetBIOS names. WINS is considered to be a dynamic protocol because it allows hosts, services and users to be registered in the WINS databse on the WINS server automatically when they connect to the network. This saved Network Administrators a great deal of time over having to update and maintain separate LMHOSTS files all over the network.
4⟩ Explain, you need to connect a Token Ring segment to an Ethernet segment. Would you use a router, a brouter, or a bridge?
Please share your answers.
5⟩ What is frame relay, in which layer it comes?
Frame relay is a high-performance WAN protocol that operates at the physical and data link layers of the OSI reference model. Frame Relay originally was designed for use across Integrated Services Digital Network (ISDN) interfaces. Today, it is used over a variety of other network interfaces as well. This chapter focuses on Frame Relay's specifications and applications in the context of WAN services. Frame Relay is an example of a packet-switched technology.
Packet-switched networks enable end stations to dynamically share the network medium and the available bandwidth.
The following two techniques are used in packet-switching technology:
•Variable-length packets
•Statistical multiplexing Variable-length packets are used for more efficient and flexible data transfers. These packets are switched between the various segments in the network until the destination is reached.
6⟩ Explain what is frame relay, in which layer it comes?
Frame relay is a high-performance WAN protocol that operates at the physical and data link layers of the OSI reference model. Frame Relay originally was designed for use across Integrated Services Digital Network (ISDN) interfaces. Today, it is used over a variety of other network interfaces as well. This chapter focuses on Frame Relay's specifications and applications in the context of WAN services. Frame Relay is an example of a packet-switched technology.
Packet-switched networks enable end stations to dynamically share the network medium and the available bandwidth.
The following two techniques are used in packet-switching technology:
•Variable-length packets
•Statistical multiplexing Variable-length packets are used for more efficient and flexible data transfers. These packets are switched between the various segments in the network until the destination is reached.
7⟩ What are the types of protocols and what are its functions and for what purpose this protocol is used give me a brief explanation?
There are so many types of protocol which supports a different layers of TCP/IP protocol.
1. internet layer -IP, IGMP, ICMP, ARP,RARP
2. Transport Layer - TCP, UDP
3. Application Layer -FTP, SNMP, SMTP, Telnet, TFTP, DNS, HTTP.
Here TCP is a Connection oriented protocol and UDP is a connection less protocol.
The Full form of the above protocol are given below.
1. IP - Internet Protocol
2. IGMP - Internet Groups Message Protocol
3. ICMP - Internet Control Message Protocol
4. ARP - Address Resolution Protocol
5. RARP - Reverse Address Resolution Protocol.
6. FTP -File Transfer Protocol.
8⟩ How to Re-cover The crashed files in outlook? What is the Limitation(users) of outlook?
Hiwe can retreive a crashed outlook file with a SCANPST.EXE file.u can find this scanpst executable file in all windows(98,2000,xp) platforms.so u search this file in ur c:programfilescommon folder.so dont worry when ur outlook file crashed and dont try for third party utilities to retrieve ur pst file.vizaghari@gmail.com
9⟩ Explain what protocol is used by DNS name servers?
DNS uses UDP for communication between servers. It is a better choice than TCP because of the improved speed a connectionless protocol offers. Of course, transmission reliability suffers with UDP.
10⟩ Explain what is router?
A router is a device that forwards data packets along networks. A router is connected to at least two networks, commonly two LANs or WANs or a LAN and its ISP's network. Routers are located at gateways, the places where two or more networks connect, and are the critical device that keeps data flowing between networks and keeps the networks connected to the Internet. When data is sent between locations on one network or from one network to a second network the data is always seen and directed to the correct location by the router. They accomplish his by using headers and forwarding tables to determine the best path for forwarding the data packets, and they use protocols such as ICMP to communicate with each other and configure the best route between any two hosts. The Internet itself is a global network connecting millions of computers and smaller networks — so you can see how crucial the role of a router is to our way of communicating and computing.
11⟩ Explain what is the difference between domain & workgroup?
Domain:
1) Centralized Administration.
2) Security of Data, User & Groups
3)Server & Clients Based
4)Windows 2000 & 2003 Server or Advance Support For Server Configuration
5)File, Folder & User & Group Permission we can assign.
WORKGROUP:
1)No Centralized Administration.
2)Not much security for Data, User & Groups. (Depends on Configuration)
3)No Server & Client Matter..Each pc reacts like a Client as well as Server.
4)Basically Windows 98 & XP is going to used in Clients side.
5)We can assign permission to drives & folder & files but much security than Domain
12⟩ What is DORA process?
DORA stands for discover , offer , request and acknowledgementwhen we install a dhcp server into our network then dhcp server works on the basis of dora process first dhcp server sends a hello message in to the network to discover the clients pc and when any client pc found in the network then , dhcp server offers the IP to client pc. When client pc select any IP from dhcp server then client pc request for selected IP to dhcp server then dhcp server provide that IP to client pc and both send ackonledgement to each other.This process is called DORA process on the basis of this process DHCP server works to provide IP's dynamically to client pc's in network
13⟩ Explain the Pros and Cons of layer design?
I know only the advantages of Layered design. We can treat each layer as a problem area. Say for example, data link layer, people can concentrate only on the device driver only, they dont need to worry about the network related meaning how the packet can be routed etc. The only responsiblility of the device driver layer is to grab the packet destined to the local MAC and pass the frame to the network layer. Similary the network layer doesnt need to worry about how the packet is reached to the local machine. Its only responsibility is to check whether the packet belongs to the local machine or to be forwarded. Also build the routing table to forward the packet. This way, each forum can precisely concentrate on one problem/layer.
14⟩ Explain what is the requirement of dns?
DNS means Domain name Server or Domain name system.
Requirement of DNS :
DNS helps to convert the ip address into domain name.Domain name into ip address.You cannot remember many website ip address at same time.So domain name is used for remembering the website.
For example 74.125.239.17 is one ip address of Google.com.It is very difficult to remember always.So you can use domain name to view the particular website.The primary work of DNS is if you give ip address in browser ,it search for domain name of particular ip address.If you give domain name in the address bar of the browser it convert the domain name to ip address(Search for the particular ip address). If you have any queries regarding DNS records use http://www.whois.se/
15⟩ Can we communicate by using only the MAC address in Same network?
Please share your answers.
16⟩ Your network uses both IPX and Net BEUI. Which device would provide the best connectivity if you have many (more than 10) segments?
Nobody uses either of those protocols anymore. If you took a time machine 20 years in the past, you would use IPX on your mulch-segment system.
17⟩ Explain what is Gateway-to-Gateway protocol?
Gateway-to-Gateway Protocol is similar to the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).
It is a protocol used for routing datagrams between Internet gateways.Each GGP message has a field header that identifies the message type and the format of the remaining fields.
18⟩ Default port no. forTelnet ___ ?SNMP ____?FTP ____?
Default Port Number for
Telnet : 23
SNMP : 161
FTP : 21
19⟩ Explain what is the role of network administrator?
Here is a very short list of basic tasks for which a network administrator may be responsible:Setting up and configuring network hardware and software Installing and configuring network media and connections Connecting user nodes and peripherals of all kinds to the network Adding users to and removing users from the network Managing user accounts, such as passwords, storage space, and file-access privileges Creating and maintaining a system for backing up data and program files Ensuring the security of the network Managing the organization's e-mail system Managing users' ability to access the Internet via the network Training users to utilize the network's resources
20⟩ Explain what is Ipsec tunneling, how it works?
IP tunneling (IP encapsulation) is a technique to encapsulate IP datagram within IP datagrams, which allows datagrams destined for one IP address to be wrapped and redirected to another IP address. IP encapsulation is now commonly used in Extranet, Mobile-IP, IP-Multicast, tunneled host or network.
