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Note:- In bus topology at the first, the message will go through the bus then one user can communicate with otherNAK frames, which are numbered, tell the sender to retransmit the last frame sentWe also know that signal transmission is always attached with energy lossFor one million people to communicate, a half-billion secret keys are neededIf the sender sends a datagram of 100 bytes, the receiver must read all 100 bytes at once10001111 Routers operate primarily by examining incoming data for its network routing and transport informationVirtual Circuit Approach: The relationship between all packets belonging to a message or session is preservedPhysical topology refers to the placement of the network's various components, inducing device location and cable installation, while logical topology shows how data flows within a network, regardless of its physical designEach node in the tree defines a domain which is an index to the domain name space database
Address uses a subnet maskThe data area contains information written by the application program that created the packet—for example, your Web browser, FTP, or TELNET programSwitch : Switches are an expansion of the concept of bridgingNetwork layer does not recognise any relationship between the packets deliveredNo one can generate two messages that have the same message digestUsers based on e-mail addressesThe sender device is equipped with a timer1000-Mbps Ethernet: A single LAN specification, also known as Gigabit Ethernet, that operates at 1000 Mbps (1 Gbps) over fiber and twisted-pair cablesIf a frame is corrupted in transmit, a NAK is returned and the frame is resent out of sequenceNote: In bus topology at the first, the message will go through the bus then one user can communicate with other
The size of the pixel depends on what is called the resolutionSpace Division Switching: Separates the path in the circuit from each other spatiallySymmetric cipher: uses same key for encryption and decryption It Uses 16 rounds which all perform the identical operationLike stop and wait ARQ, the sending device in sliding window ARQ is equipped with a timer to enable it to handle lost acknowledgements11001111 Class Ranges of Internet Address in Dotted Decimal Format Three Levels of Hierarchy: Adding subnetworks creates an intermediate level of hierarchy in the IP addressing systemSMTP provides services for mail exchange between users on the same or different computersThe frames in the window are numbered modulo-n, which means they are numbered from 0 to n -1Routers, comprise one kind of firewallIn the data link layer, packets on a point-to-point line can be encoded
In message switching, the massages are stored and relayed from secondary storage (disk), while in packet switching the packets are stored and forwarded from primary storage (RAM)Generate the secret in formations (keys) used by the algorithmIntegrity control: how can you be sure that a message you received was really the one sent and not something that a malicious adversary modified in transit or concocted? There is no one single place -- every layer has something to contribute : In the physical layer, wiretapping can be foiled by enclosing transmission lines in sealed tubes containing argon gas at high pressureArea border routers: Connect to areas together Backbone routers: Reside only in the backbone area AS boundary routers: Routers that connect to a router outside the ASA MACed message is not necessarily encryptedPVC (Permanent Virtual Circuit) The PVC format is comparable to leased lines in circuit switching 3db19cccfd
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