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9 B Confidentiality is provided by encryption algorithms such as DES, 3DES, and AES A is incorrect because MD5 is an HMAC function, which provides for packet integrity; C is incorrect because DH is used to exchange keys for encryption and HMAC functions; D is incorrect because IKE is used to manage create and manage keys on a VPN device 10 A and D The two components of Easy VPN are Server and Remote (sometimes called Client) B and C, Gateway and Host, are nonexistent terms in Easy VPN
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2601 2602 2603 Virtual Circuits Frame Relay Terms Frame Relay Configuration 2604 Non-Broadcast Multi-Access Environments Two-Minute Drill Self Test
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hapter 25 introduced you to wide area networking and point-to-point connections using High-Level Data Link Control (HDLC) and Point-to-Point Protocol (PPP) for a data link layer encapsulation These protocols are common with leased lines and circuitswitched connections This chapter introduces you to the second WAN topic: Frame Relay Frame Relay is a data link layer packet-switching protocol that uses digital circuits to transmit data and thus is virtually error-free Therefore, it performs only error detection it leaves error correction to an upper layer protocol, such as TCP or the application itself Frame Relay is actually a group of separate standards, including those from ITU-T and ANSI Interestingly enough, Frame Relay defines only the interaction between the Frame Relay customer premises equipment (CPE) and the Frame Relay carrier switch The connection across the carrier s network is not defined by the Frame Relay standards Most carriers, however, use Asynchronous Transfer Mode (ATM) as a transport to move Frame Relay frames between different sites
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CERTIFICATION OBJECTIVE 2601
Virtual Circuits
Frame Relay is connection-oriented: a layer 2 connection must be established before information can be sent to a remote device The connections used by Frame Relay are provided by virtual circuits (VCs) A VC is a logical connection between two devices; therefore, many VCs can exist on the same physical interface The advantage that VCs have over leased lines is that they can provide full connectivity (fully meshed) at a much lower price VCs are also full-duplex: you can simultaneously send and receive on the same VC Other packet- and cell-switching technologies, such as ATM and X25, also use VCs Most of the information covered in this section concerning VCs is true of Frame Relay as well as these other technologies
Fully Meshed Design
As mentioned, VCs are more cost-effective than leased lines because they reduce the number of physical connections required to fully mesh your network, but still allowing a fully meshed topology Let s assume you have two choices for connecting four WAN devices together: leased lines and VCs The top part of Figure 26-1 shows
Virtual Circuits
FIGURE 26-1
Leased lines and VCs
an example of connecting these devices using leased lines Notice that to fully mesh this network (every device is connected to every other device), a total of six leased lines is required, including three serial interfaces on each router To figure out the number of connections required, you can use the following formula: (N (N 1)) / 2 In this formula, N is the number of devices you are connecting together In our example, this was four devices, resulting in (4 (4 1)) / 2 = 6 leased lines The more devices that you have, the more leased lines you need, as well as additional serial interfaces on each router For instance, if you have 10 routers you want to fully mesh, you would need a total of 9 serial interfaces on each router and a total of 45 leased lines! If you were thinking of using a smaller end router, such as a 2600, this would be unrealistic Therefore, you would need a larger router, such as
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