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IP DATAGRAM SIZE:
Datagrams may have different sizes i.e. Header area is generally fixed (20 octets) but can have various options. Data area may contain between 1 octet and 65.535 octets (216-1).Generally, data area is much bigger than header.
FORWARDING DATAGRAMS:
Header contains all information required to deliver datagram to the receiver computer. It has:
Router checks header of every datagram and forwards datagram along path to destination.
ADVANCED RESEARCH PROJECT AGENCY (ARPA) The efforts of ARPA was to active all its research groups have accept to new era computers. For this purpose ARPA started investing in wa
B a s i c functions of e-mail system are given as follows: C o mp o sition refers to the procedure of creating messages and the answers. Though any text editor can be
Application Gateways / firewall The application level firewall is installed on a dedicated computer; also called as a proxy server. These servers can store the recently accessed
CONCEPT OF PACKET : Network systems splits data in small junks or blocks known as packets, which they send individually. Why we required packets rather than bits? The answer to
Network can be distinguished by shape. According to which there are three most popular methodologies, which are shown as follows; Star Ring Bus
COLLISION DETECTION The signals from two devices will interfere with each other and the overlapping of frames is known a collision. It does not cause to the hardware but data
Public Key Infrastructure (PKI) It is integrated system of software, encryption methodologies, protocols, legal agreements, and 3rd-party services enabling users to communicate
FIREWALL ANALYSIS TOOLS There are a number of tools automate remote discovery of firewall rules and assist the administrator in analyzing rules Administrators who feel wary of u
A half-duplex (HDX) system gives communication in both directions, but only one direction at a time. Hardly, once a party stats receiving a signal, it must need for the transmi
(a) Show four Network Security attacks. How do they compromise security? (b) In what ways do the following devices or services contribute to security: (i) Firewall (ii) In
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