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Networking Interview Questions and Answers

What is anonymous FTP and why would you use it?
Anonymous FTP enables users to connect to a host without using a valid login and password. Usually, anonymous FTP uses a login called anonymous or guest, with the password usually requesting the user's ID for tracking purposes only. Anonymous FTP is used to enable a large number of users to access files on the host without having to go to the trouble of setting up logins for them all. Anonymous FTP systems usually have strict controls over the areas an anonymous user can access.

What is the difference between an unspecified passive open and a fully specified passive open?
An unspecified passive open has the server waiting for a connection request from a client. A fully specified passive open has the server waiting for a connection from a specific client.

What is virtual path?
Along any transmission path from a given source to a given destination, a group of virtual circuits can be grouped together into what is called path.

Explain the function of Transmission Control Block?
A TCB is a complex data structure that contains a considerable amount of information about each connection.

What is a DNS resource record?
A resource record is an entry in a name server's database. There are several types of resource records used, including name-to-address resolution information. Resource records are maintained as ASCII files.

What is a pseudo tty?
A pseudo tty or false terminal enables external machines to connect through Telnet or rlogin. Without a pseudo tty, no connection can take place.

What is the Network Time Protocol?
A protocol that assures accurate local timekeeping with reference to radio and atomic clocks located on the Internet. This protocol is capable of synchronising distributed clocks within milliseconds over long time periods. It is defined in STD 12, RFC 1119.

What is mesh network?
A network in which there are multiple network links between computers to provide multiple paths for data to travel.

What is RAID?
A method for providing fault tolerance by using multiple hard disk drives.

What is a Management Information Base (MIB)?
A Management Information Base is part of every SNMP-managed device. Each SNMP agent has the MIB database that contains information about the device's status, its performance, connections, and configuration. The MIB is queried by SNMP.

What is cladding?
A layer of a glass surrounding the center fiber of glass inside a fiber-optic cable.

What is subnet?
A generic term for section of a large networks usually separated by a bridge or router.

A gateway operates at the upper levels of the OSI model and translates information between two completely different network architectures or data formats.

What is point-to-point protocol?
A communications protocol used to connect computers to remote networking services including Internet service providers.

What are 10Base2, 10Base5 and 10BaseT Ethernet LANs ?
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 and twisted pair cabling.

What are the possible ways of data exchange?
(i) Simplex
(ii) Half-duplex
(iii) Full-duplex.

What are the two types of transmission technology available?
(i) Broadcast
(ii) point-to-point.

How do I convert a numeric IP address like into a hostname like
String hostname = InetAddress.getByName("").getHostName();

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