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Computer Networks Interview Questions & Answers - Learning Mode
COOLINTERVIEW.COM NETWORKING INTERVIEW QUESTIONS COMPUTER NETWORKS INTERVIEW QUESTIONS QUESTIONS & ANSWERS - LEARNING MODE

Computer Networks Interview Questions & Answers - Learning Mode

A computer network or data network is a telecommunications network which allows computers to exchange data. In computer networks, networked computing devices exchange data with each other using a data link. The connections between nodes are established using either cable media or wireless media. A computer network is a set of computers connected together for the purpose of sharing resources. The most common resource shared today is connection to the Internet. Other shared resources can include a printer or a file server.

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Computer Networks Interview Questions & Answers - Learning Mode
Try Computer Networks Interview Questions & Answers - Exam Mode
Question: What is PING utility?



Answer: PING stands Packet Internet Gopher. This is a utility for ensuring connectivity between computers . ICMP protocol works behind this utility. Under it , sending node sends packets to destination node and reply is received if there is proper communication between two. Source: CoolInterview.com
Question: What is NETBIOS and NETBEUI?

Answer: NETBIOS is a programming interface that allows I/O requests to be sent to and received from a remote computer and it hides the networking hardware from applications.

NETBEUI is NetBIOS extended user interface. A transport protocol designed by microsoft and IBM for the use on small subnets. Source: CoolInterview.com
Question: What is RAID?

Answer: A method for providing fault tolerance by using multiple hard disk drives. Source: CoolInterview.com
Question: What are the advantages and disadvantages of the three types of routing tables?

Answer: The three types of routing tables are fixed, dynamic, and fixed central. The fixed table must be manually modified every time there is a change. A dynamic table changes its information based on network traffic, reducing the amount of manual maintenance. A fixed central table lets a manager modify only one table, which is then read by other devices. The fixed central table reduces the need to update each machine's table, as with the fixed table. Usually a dynamic table causes the fewest probl Source: CoolInterview.com
Question: What are 10Base2, 10Base5 and 10BaseT Ethernet LANs ?

Answer: 10Base2?An Ethernet term meaning a maximum transfer rate of 10 Megabits per second that uses baseband signaling, with a contiguous cable segment length of 100 meters and a maximum of 2 segments.

10Base5?An Ethernet term meaning a maximum transfer rate of 10 Megabits per second that uses baseband signaling, with 5 continuous segments not exceeding 100 meters per segment.

10BaseT?An Ethernet term meaning a maximum transfer rate of 10 Megabits per second that uses baseband signaling a Source: CoolInterview.com
Question: What are the different type of networking / internetworking devices?

Answer: Repeater:
Also called a regenerator, it is an electronic device that operates only at physical layer. It receives the signal in the network before it becomes weak, regenerates the original bit pattern and puts the refreshed copy back in to the link.

Bridges:
These operate both in the physical and data link layers of LANs of same type. They divide a larger network in to smaller segments. They contain logic that allow them to keep the traffic for each segment separate and thus are rep Source: CoolInterview.com
Question: What is difference between baseband and broadband transmission?

Answer: In a baseband transmission, the entire bandwidth of the cable is consumed by a single signal. In broadband transmission, signals are sent on multiple frequencies, allowing multiple signals to be sent simultaneously. Source: CoolInterview.com
Question: Why should we care about the OSI Reference Model ?
What is the main purpose for creating this OSI model?
Why it is a layered model?



Answer: Why should we care about the OSI Reference Model ?
What is the main purpose for creating this osi model?
why it is a layered model?

Source: CoolInterview.com
Question: What is wide-mouth frog?

Answer: Wide-mouth frog is the simplest known key distribution center (KDC) authentication protocol. Source: CoolInterview.com
Question: What is a difference between switch and Hub?



Answer: HUb: limiteded port compare to switch.less speed compare to switch because

more collision.

Switch: To Avoid collision we use switch. In switch Each Port having own collision Domain.
Source: CoolInterview.com
Question: What is a VLAN?What does VLAN provide?



Answer: A technology called VLAN (Virtual LAN broadcast domains logically segmented on an Ethernet switch) trunking that was once primarily the domain of network switches has now trickled down to the rest of the Data Center to address these issues. Now it is possible for these multi-homing devices to be multi-homing in function without the need for multiple physical network adapters and the additional infrastructure associated with them. VLAN trunking allows a single network adapter to behave as ?n? n Source: CoolInterview.com
Question: If you are given the IP address can u tell how many computers can be connected?What do you look at?



Answer: Normally in IP address in fourth tab usually they will give the serial number of the using computer. in that case we can say how many computers are there. if not its impossiable to say. Source: CoolInterview.com
Question: What is SIP? how does it work? what are the alternatives if any? current and future practice and application standards? references(books,urls,rfcs etc)

Answer: SIP is meant for Session Initiation Protocol. It works in application layer. It specially used for initiating, modifying and terminating a session. you can find all details in rfc3261. Source: CoolInterview.com
Question: Difference between the communication and transmission?

Answer: Transmission is a physical movement of information and concern issues like bit polarity, synchronisation, clock etc.

Communication means the meaning full exchange of information between two communication media. Source: CoolInterview.com
Question: What are the Advantages and Disadvantages of DHCP?



Answer: Advantages
All the IP configuration information gets automatically configured for your client machine by the DHCP server.
If you move your client machine to a different subnet, the client will send out its discover message at boot time and work as usual. However, when you first boot up there you will not be able to get back the IP address you had at your previous location regardless of how little time has passed.
Disadvantage

Your machine name does not change when you get a n Source: CoolInterview.com
Question: What are the types of Transmission media?

Answer: Signals are usually transmitted over some transmission media that are broadly classified in to two categories:-

Guided Media:
These are those that provide a conduit from one device to another that include twisted-pair, coaxial cable and fiber-optic cable. A signal traveling along any of these media is directed and is contained by the physical limits of the medium. Twisted-pair and coaxial cable use metallic that accept and transport signals in the form of electrical current. Optical fi Source: CoolInterview.com
Question: What is the difference between tree and forest?

Answer: The basic difference is Forest is main domain who can control all tree on networks. Source: CoolInterview.com
Question: What is region?

Answer: When hierarchical routing is used, the routers are divided into what we call regions, with each router knowing all the details about how to route packets to destinations within its own region, but knowing nothing about the internal structure of other regions.
Source: CoolInterview.com
Question: What is MAC address?

Answer: The address for a device as it is identified at the Media Access Control (MAC) layer in the network architecture. MAC address is usually stored in ROM on the network adapter card and is unique. Source: CoolInterview.com
Question: What is the difference between physical address and logical address?



Answer: A Physical address is a 48-bit flat address burned into the ROM of the NIC card which is a Layer1 device of the OSI model. This iis divided into 24-bit vendor code and 24-bit serial address. This is unique for each system and cannot be changed.

A Logical address is a 32- bit address assigned to each system in a network. This works in Layer-3 of OSI Model. This would be generally the IP address.
Source: CoolInterview.com

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Latest 20 Questions
Payment of time- barred debt is: (a) Valid (b) Void (c) Illegal (d) Voidable
Consideration is defined in the Indian Contract Act,1872 in: (a) Section 2(f) (b) Section 2(e) (c) Section 2(g) (d) Section 2(d)
Which of the following is not an exception to the rule, "No consideration, No contract": (a) Natural love and affection (b) Compensation for involuntary services (c) Completed gift (d) Agency
Consideration must move at the desire of: (a) The promisor (b) The promisee (c) The promisor or any other party (d) Both the promisor and the promisee
An offer which is open for acceptance over a period of time is: (a) Cross Offer (b) Counter Offer (c) Standing Offer (d) Implied Offer
Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
_________ amounts to rejection of the original offer. (a) Cross offer (b) Special offer (c) Standing offer (d) Counter offer
A advertises to sell his old car by advertising in a newspaper. This offer is caleed: (a) General Offer (b) Special Offer (c) Continuing Offer (d) None of the above
In case a counter offer is made, the original offer stands: (a) Rejected (b) Accepted automatically (c) Accepted subject to certain modifications and variations (d) None of the above
In case of unenforceable contract having some technical defect, parties (a) Can sue upon it (b) Cannot sue upon it (c) Should consider it to be illegal (d) None of the above
If entire specified goods is perished before entering into contract of sale, the contract is (a) Valid (b) Void (c) Voidable (d) Cancelled
______________ contracts are also caled contracts with executed consideration. (a) Unilateral (b) Completed (c) Bilateral (d) Executory
A offers B to supply books @ Rs 100 each but B accepts the same with condition of 10% discount. This is a case of (a) Counter Offer (b) Cross Offer (c) Specific Offer (d) General Offer
_____________ is a game of chance. (a) Conditional Contract (b) Contingent Contract (c) Wagering Contract (d) Quasi Contract
There is no binding contract in case of _______ as one's offer cannot be constructed as acceptance (a) Cross Offer (b) Standing Offer (c) Counter Offer (d) Special Offer
An offer is made with an intention to have negotiation from other party. This type of offer is: (a) Invitation to offer (b) Valid offer (c) Voidable (d) None of the above
When an offer is made to the world at large, it is ____________ offer. (a) Counter (b) Special (c) General (d) None of the above
Implied contract even if not in writing or express words is perfectly _______________ if all the conditions are satisfied:- (a) Void (b) Voidable (c) Valid (d) Illegal
A specific offer can be accepted by ___________. (a) Any person (b) Any friend to offeror (c) The person to whom it is made (d) Any friend of offeree
An agreement toput a fire on a person's car is a ______: (a) Legal (b) Voidable (c) Valid (d) Illegal
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