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How Does a Firewall Protect
Firewalls work by controlling the information that comes in and out of the network. By using the Application Proxy service, the flow of information to the network can be controlled. A proxy is an application program that permits or forbids access by accepting or rejecting requests sent to it. Only valid users can log in and pass through a proxy service. It works on the Application level of the OSI model . Another technique that can be used is Encryption. A firewall may also combine encryption to provide confidentiality and authenticity. However this feature never works alone but is always combined with one of the above methods.
Network layer duties Internetwork - Physical and Data link layers are jointly responsible for data delivery on the network from node to node
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What is primary and secondary ring One of the two FDDI rings is known as the primary ring; the other is called the secondary ring. The primary ring is utilized for data tra
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Shortest path The dijkstra algorithms four steps to discover what it called the shortest path tree . a.The algorithm beings to build the tree identifying its root.
Encryption Authentication One common technique used to encrypt and authenticate in VPNs is IP security. IP sec is a collection of protocols designed by the IETF( Internet En
Ethernet Addressing Every station on the network must have a unique physical address Offered by a six-byte physical address encoded on the network interface card (NIC)
ARP(ADDRESS RESOLUTION PROTOCOL) is a network layer protocol which associates the physical hardware address of a network node(commonly called as a MAC ADDRESS) to its ip address. n
Q. Show Example on Check Sum? Data: 10101001 00111001 Computing Checksum: 10101001 00111001 --------------- Sum 11100010 Receiver Side: 10101
Multicast and Broadcast In broadcast interconnection network at an individual time one node sends the data and all other nodes obtain that data. Broadcast can be termed as on
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