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Networking Interview Questions - Part 4

What is the purpose of cables being shielded and having twisted pairs ?

The main purpose of this is to prevent crosstalk. Crosstalks are electromagnetic interferences or noise that can affect data being transmitted across cables.

What is the advantage of address sharing ?

By using address translation instead of routing, address sharing provides an inherent security benefit. Thatís because host PCs on the Internet can only see the public IP address of the external interface on the computer that provides address translation and not the private IP addresses on the internal network.

What are MAC addresses ?

MAC, or Media Access Control, uniquely identifies a device on the network. It is also known as physical address or Ethernet address. A MAC address is made up of 6-byte parts.

What is the equivalent layer or layers of the TCP/IP Application layer in terms of OSI reference model ?

The TCP/IP Application layer actually has three counterparts on the OSI model: the Session layer, Presentation Layer and Application Layer.

How can you identify the IP class of a given IP address ?

By looking at the first octet of any given IP address, you can identify whether itís Class A, B or C. If the first octet begins with a 0 bit, that address is Class A. If it begins with bits 10 then that address is a Class B address. If it begins with 110, then itís a Class C network.

What is the main purpose of OSPF ?

OSPF, or Open Shortest Path First, is a link-state routing protocol that uses routing tables to determine the best possible path for data exchange.

What are firewalls ?

Firewalls serve to protect an internal network from external attacks. These external threats can be hackers who want to steal data or computer viruses that can wipe out data in an instant. It also prevents other users from external networks from gaining access to the private network.

Describe star topology

Star topology consists of a central hub that connects to nodes. This is one of the easiest to setup and maintain.

What are gateways ?

Gateways provide connectivity between two or more network segments. It is usually a computer that runs the gateway software and provides translation services. This translation is a key in allowing different systems to communicate on the network.

What is the disadvantage of a star topology ?

One major disadvantage of star topology is that once the central hub or switch get damaged, the entire network becomes unusable.

Networking Interview Questions - Part 5 >>>

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