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Firewalls
After several security related internet newsgroups started overflowing with posts it becomes clear something hand to done to help secure networks. The first firewalls were implemented in routers between different segment s of the network. These firewalls were basically ACLs in routers.
Slowly firewall technology started to evolve. Early firewall technology known as packet filtering was not enough to stop the constant attacks. The firewall had to more intelligent and understand the different protocols.
Q. Show the Error control in TCP? Error control in TCP Detect lost segments, out-of-order segments, corrupted segments and duplicated segments Three tools: chec
Define Retransmission? Retransmission is a process in which the receiver detects the occurrence of an error and asks the sender to resend the message. Resending is repeated unt
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Q. Unshielded Twisted Pair - transmission media? - A most common kind suitable for both voice and data transmission - Categories are determined by chain quality - Cat 3 c
The are various limitations of employing Wireless LAN technology in any multistory building in middle of Melbourne or any other big city are: • Range: The main problem of Wire
State about the Packet filter firewalls They remain the most common type of firewall in use as of today. They were the earliest firewalls developed and were capable of permitt
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Q. Example on Multiplicative Decrease? w = 1 for (each new ACK received) w = w+1 until (loss detected or w >= ssthresh) Not so slow - Exponential increase
Ethernet Frame Format Consists of seven fields There is No mechanism for acknowledging received frames considered an unreliable medium
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