Find Interview Questions for Iccr (indian council for cultural relations)

Fwd Lookup resolves a Hostname to its IP address
Rev Lookup resolves a IP Address to its Hostname

Forware Lookup resolves (converts) FQDN name into IP address
EX: www.allinterview.com into 192.168.5.253
Reverse Lookup resolves (converts)IP Address into FQDN
FQDN = Fully Qualified Domain Name

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

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 and but frame relay is costly in compare with
others

A firewall is a part of the computer or network which
prevents unauthorized access to it.Firewalls are frequently
used to prevent unauthorized Internet users from accessing
private networks connected to the Internet.It regulates
traffic of the network of different trust levels.
On the other hand,Access Control List refers to rules that
are applied to port numbers or network daemon names that are
available on a host, each with a list of hosts and/or
networks permitted to use the service. Both individual
servers as well as routers can have network ACLs.
This way. ACL are the rules to be implemented for security
while firewall is he complete setup or mechanism.

Firewall provides a permission or destroys for a packet to
enter inside our network from private network .
Acl's which provide rules to control which type of packet
to be destroyed or permitted

networks are layered so that it can be differentiated that
how the data is being organized and deorganized during the
transfer and how the work is being accompolished by the
whole osi model.....

- To create standards (Network equipment manufacturers
manufacture the equipments based on approved standards to
allow equipment from different manufacturers to communicate
properly)
- For learning purpose (Easy to understand traffic flow
across the network in a layered approach)
- To give room for specialization (Research groups
specializing in specific areas of interest)