Try Practicing Top interview questions for Computer Security by Pritish Kumar Halder

Q1. What Is Beaconing?

The process that allows a network to self-repair networks problems. The stations on the network notify the other stations on the ring when they are not receiving the transmissions. Beaconing is used in Token ring and FDDI networks.

Q2. What Is The Difference Between Routable And Non- Routable Protocols?

Routable protocols can work with a router and can be used to build large networks. Non-Routable protocols are designed to work on small, local networks and cannot be used with a router

Q3. Bootp Helps A Diskless Workstation Boot. How Does It Get A Message To The Network Looking For Its Lp Address And The Location Of Its Operating System Boot Files?

BQOTP sends a UDP message with a subnetwork broadcast address and waits for a reply from a server that gives it the IP address. The same message might contain the name of the machine that has the boot files on it. If the boot image location is not specified, the workstation sends another UDP message to query the server.

Q4. Name One Secure Network Protocol Which Can Be Used Instead Of Telnet To Manage A Router?


Q5. What Is Virtual Channel?

A virtual channel is normally a connection from one source to one destination, although multicast connections are also permitted. The other name for virtual channel is virtual circuit.

Q6. What Is Bandwidth

Every line has an upper limit and a lower limit on the frequency of signals it can carry. This limited range is called bandwidth.

Q7. What Is Mac Address?

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.

Q8. Difference Between Bit Rate And Baud Rate?

Bit rate is the number of bits transmitted during one second whereas baud rate refers to the number of signal units per second that are required to represent those bits.

baud rate = bit rate / N
where N is no-of-bits represented by each signal shift.

Q9. What Is Netbios And Netbeui ?

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 was designed by Microsoft and IBM for the use of small subnets.

Q10. Which Feature On A Cisco Ios Firewall Can Be Used To Block Incoming Traffic On A Ftp Server?

Extended ACL.

Q11. 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.

Q12. What Is the Difference Between Baseband And Broadband transmission?

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.

Q13. What Do You Mean By “triple X” In Networks?

The function of PAD (Packet Assembler Disassembler) is described in a document known as X.@The standard protocol has been defined between the terminal and the PAD, called X.28; another standard protocol exists between the PAD and the network, called X.2@Together, these three recommendations are often called “triple X”

Q14. What Is A Pseudo Tty?

A pseudo try or false terminal enables external machines to connect through Telnet or log in. Without a pseudo TTY, no connection can take place.

Q15. What Is Sap?

Series of interface points that allow other computers to communicate with the other layers of the network protocol stack.

Q16. What Is Rip (routing Information Protocol)?

It is a simple protocol used to exchange information between the routers.

Q17. What Is Silly Window Syndrome?

It is a problem that can ruin TCP performance. This problem occurs when data are passed to the sending TCP entity in large blocks, but an interactive application on the receiving side reads 1 byte at a time.

Q18. What Are The Important Topologies For Networks?

BUS topology: In this, each computer is directly connected to the primary network cable in a single line.
Advantages: Inexpensive, easy to install, simple to understand, easy to extend.

STAR topology: In this, all computers are connected using a central hub.
Advantages: Can be inexpensive, easy to install and reconfigure, and easy to troubleshoot physical problems.

RING topology: In this, all computers are connected in a loop.
Advantages: All computers have equal access to network media, installation can be simple, and signal does not degrade as much as in other topologies because each computer regenerates it.

Q19. What Are The Types Of Transmission media?

Signals are usually transmitted over some transmission media that are broadly classified into two categories.

Guided Media: These are those that provide a conduit from one device to another that includes 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 cables use metallic that accept and transport signals in the form of electrical current. Optical fiber is a glass or plastic cable that accepts and transports signals in the form of light.

Unguided Media: This is the wireless media that transports electromagnetic waves without using a physical conductor. Signals are broadcast either through air. This is done through radio communication, satellite communication, and cellular telephony.

Q20. What Is Not (network Virtual Terminal)?

It is a set of rules defining a very simple virtual terminal interaction. The NVT is used in the start of a Telnet session.

Q21. What Is Mesh Network?

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

Q22. What Is Wide-mouth Frog?

Wide-mouth frog is the simplest known key distribution center (KDC) authentication protocol.

Q23. What Is Terminal Emulation, In Which Layer It Comes

Telnet is also called terminal emulation. It belongs to the application layer.

Q24. 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.

Q25. What Is Proxy Arp?

It is using a router to ARP requests. This will be done when the originating host believes that a destination is local, when in fact it lies beyond the router.