1. What is the difference between node and
host?
A node is any addressable device connected to
a network whereas the host is a more specific descriptor that refers to a
networked general-purpose computer rather than a single purpose device (such as
a printer).
2. What is the purpose of routers?
Router operates like electronic postal workers
that evaluate and forward packets
between networks.
3. Define protocol.
A protocol is a formal set of rules that must
be followed in order to communicate.
4. Why are the protocols layered?
Layering protocols simplifies the task of
communicating over the network and it
allows for reuse of layers that are not
specific to a particular application.
5. Define encapsulation.
Placing the data inside a package of headers
is known as encapsulation.
6. Define port.
A port is a logical channel to an application
running on a host. ie., The applications running on the host machines are
uniquely identified by port numbers.
7. What do you mean by well-known ports?
Port numbers can range from 1 to 65535;
however ports 1 to 1023 are reserved.
These reserved ports are referred to as
we1l-known ports because the Internet Assigned Numbers Authority publicly
documents the applications that use them.
8. What is meant by Name Resolution?
Name Resolution is the process of mapping a
hostname to its corresponding IP
Address.One way to translate a hostname to an
IP address is to look it up in a simple text file.The second way is the domain
name service, which is a distributed database containing all registered
hostnames on the Internet and their IP addresses.
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