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Firewalls
Firewalls emerged as a new technology in 1990s but its idea was present near two decades back. Historical context of "Firewall" is quite literal. It was in use to describe a barrier that separates a portion of a building dealing with fire, like a stove or a kitchen, from the rest of the structure. Later firewall found its use in connection with steam engines. It was described as a wall which separates an engine fire from passenger cars. Firewall ideas were greatly matured when Jeff Mogul from Digital Equipment Corporation published his papers in 1988 . His work described various processes that could be used to make networks secure. It was Marcus Ranum of AT&T Bell Laboratories who proposed the design of firewall and its components. He also coined the term "Firewall" for this quickly maturing technology. His work got much attention in 1990 and firewalls gained commercial popularity
Can you tell how actually NAT works?
Inside a device, every address mask is stored as a 32-bit number. When we submit a prefix and an address mask they use a changed form of dotted decimal addressing known CIDR addres
Reliability Reliability is the measure of how often a network is usable. MTSF( Mean time Between Failure) is a measure of the average time a component is expected to ope
Sharing information To understand how distance vector routing works examine the internet shown in the clouds represents local area network . the number inside each c
can we correct errors using crc?
Recognize the command to disable CDP on an interface Ans) Router(config-if)# no cdp enable
Can you describe RPC (Remote Procedure Calls)?
Client Server Processes A network application consist of pairs of process that send message to one another over a network. For example in a web application a client
What utility can you use to see the path a packet takes through an internetwork? Ans) Trace - Uses Time-To-Live (TTL) values to make messages from each router used along the pat
Network throughput It is a symptomatic measure of the message carrying capability of a network. It is termed as the total number of messages network can send in per unit time.
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