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this type can come from interference of the kind that results in a CRC error Additionally, framing errors can occur whenever CSU/DSU setups (framing and line coding values) on either end of the link are incompatible with the framing of the line in use All internetwork devices should be configured to use a clock from one source, because if devices on the one link are using disparate clock sources, framing errors can occur Overruns are rare; they occur if packets arrive too quickly for the router to handle This typically is a problem only if the router CPU utilization is very high and all you can do is upgrade to a router with a faster processor, or try to offload some of the work of the router to another device Abort packets occur when an illegal sequence of bits has been received Typically, to maintain synchronization, a sequence of seven or more 1s is not allowed by line coding schemes If seven or more 1s appear in a data stream, 0s are inserted to transmit the packet over the line, and are removed at the receiving end Therefore, a packet containing seven 1s is a code violation and results in an abort Output errors generally have a lesser impact on internetwork performance than input errors The show interface serial command lists collisions, which are only really applicable to Ethernet media, so rarely will this number be anything other than 0 If interface reset errors are reported, it is because keep-alive packets are being missed This could be caused by constant carrier transitions (which will be covered next), or significant output drops, or increasing numbers of input errors Generally, one of these other reported problems must be resolved to resolve interface reset problems Carrier transitions are counted whenever the carrier signal changes state This typically is due to a faulty line, or, on a less regular basis, CSU/DSU failure or faulty cabling Resolving Problems with Clock Sources A single reliable clock source is essential for synchronous communications over a telephone company data line The speed of the clock source determines the bandwidth of the line that is available for data transmission For example, a 128 kbps line will have a clock source running at 128,000 cycles per second This means that the clock source will "clock" 128 kilobits of data onto the line in 1 second A string of data being transmitted down a line consists of 1s and 0s, represented by electrical signals at a given voltage level The clock tells all devices that are communicating what length of time is used to represent a 1 or a 0 Let's say for argument's sake that the clock states that a constant voltage level for 8 s represents 1 bit (roughly what our 128 kbps clock does) If a constant voltage level is transmitted for 16 s, that means that 2 bits of the same value have been sent You can see that if the communicating devices do not agree precisely on the clock signal, they will not be able to interpret data sent between them properly When you look at the connectors between a CSU/DSU and a router interface, you see many pins, some of which are dedicated to producing a clock signal Between CSU/DSU devices, there is a telephone company line of some type that has far fewer connectors, typically two or four wires Due to the lack of individual wires on a line, the clock signal is embedded in the data stream sent over the line This means that the CSU/DSU must derive a clock signal from the data that passes through it.

When encrypting data, different methods can be used Each method has its own advantages and drawbacks, and some methods work in cooperation with others to provide an overall solution The more common methods are discussed and explained here

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oriented classless inter-domain routing (CIDR) A method of routing used to enable the network part of IP addresses to consist of a specified number of bits collision An event in which two or more devices simultaneously perform a broadcast on the same medium This term is used in ETHERNET networks, and also in networks where broadcast technology is implemented collision detection Term used to define a device that can determine when a simultaneous transmission attempt has been made congestion A network state caused by one or more overloaded network devices Congestion leads to datagram loss connected To have a physical path from one point to another connection A logical communication path between TCP users connection-oriented internetworking A set of subnetworks connected physically and thus rendered capable of connection-oriented network service connection-oriented service A type of service offered in some networks This service has three phases: connection establishment, data transfer, and connection release cracker Someone who attempts to break into computer systems, often with malicious intent data circuit-terminating equipment (DCE) Equipment required to connect a DTE to a line or to a network data-link control (DLC) A set of rules used by nodes at layer 2 within a network The data link is governed by data-link protocols such as ETHERNET or token ring for example data-link control (DLC) protocol Rules used by two nodes at a data-link layer to accomplish an orderly exchange of information Examples are ETHERNET, channel, FDDI, and token ring data-link layer Layer 2 of the OSI reference model It synchronizes transmission and handles error correction for a data link data-link level The conceptual level of control logic between high-level logic and a data-link protocol that maintains control of the data link data terminal equipment (DTE) A source or destination for data Often used to denote terminals or computers attached to a wide area network.

figUre 12-20

22 Which access method does 100BaseT use A Baseband B CSMA/CD C CSMA/CA D Token passing 23 Which access method does Token Ring use A Baseband B CSMA/CD C CSMA/CA D Token passing

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24 Which network architecture is defined as the IEEE 8023 standard A Token Ring B FDDI C Fiber D Ethernet 25 Which network architecture uses single-mode fiber-optic cabling A 1000BaseLX B 1000BaseSX C 1000BaseCX D 1000BaseTX 26 How many populated network segments can exist with 10Base2 A 1 B 2 C 3 D 5 27 Which type of cabling is used in a 10BaseFL network A STP B CAT 3 UTP C Thinnet D Thicknet e Fiber optic

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1:

28 Which Gigabit architecture uses multimode fiber cabling A 1000BaseLX B 1000BaseSX C 1000BaseCX D 1000BaseTX

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