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Remember that Cisco s implementation of HDLC is proprietary: the frame header has a proprietary Type field Know how to troubleshoot problems with HDLC interfaces: mismatch in encapsulation types, Cisco and non-Cisco devices, misconfigured IP addressing, and missed keepalive responses this statement also applies to the section on configuring PPP Remember that when you execute the show runningconfig command, if no encapsulation command is displayed in the configuration for a synchronous serial interface, the default encapsulation is HDLC
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VPNs are not currently emphasized on the exam; however, you might be asked a general question about when VPNs are most recommended, the different kinds of VPNs Cisco offers, and some of the basic terms used by a VPN, such as IPSec
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The CPE is your WAN equipment The demarcation point is the point where the carrier s responsibility for the circuit ends The local loop is the connection from the demarcation point to the carrier s WAN switching equipment There are four main WAN connection categories Leased lines include dedicated circuits, which are useful for short connections where you have constant traffic and need guaranteed bandwidth Circuit-switched connections provide dialup capabilities, as are needed for analog modems and ISDN These connections are mostly used for backup of primary connections and for an additional bandwidth boost Packet-switched connections include Frame Relay and X25 They are used to connect multiple sites together at a reasonable cost If you need guaranteed bandwidth or need to carry multiple services, cell-switched services, such as ATM, provide a better solution Cisco synchronous serial interfaces support DB-60 and DB-26 connectors The default encapsulation on these interfaces is Cisco s HDLC Cisco s HDLC and ISO s HDLC are not compatible with each other Use the encapsulation hdlc command to change an interface s encapsulation to Cisco s HDLC The show interfaces command displays the data link layer encapsulation for a serial interface PPP is one of the most commonly used data link encapsulations for serial interfaces It is an open standard It defines three things: frame type, LCP, and NCP When building a PPP connection, LCP takes place first, then authentication, and last NCP LCP is responsible for negotiating parameters, and setting up and maintaining connections, which include authentication, compression, link quality, error detection, multiplexing network layer protocols, and multilink NCP handles the negotiation of the upper layer protocols that the PPP connection will transport To set up PPP as an encapsulation type on your serial interface, use the encapsulation ppp command Use the debug ppp negotiation command to troubleshoot LCP and NCP problems There are two forms of PPP authentication: PAP and CHAP PAP sends the password across the wire in clear text, while CHAP sends a hashed output value from the MD5 hash algorithm the password is not sent across the connection PAP goes through a two-way handshake, while CHAP goes through a threeway handshake Authentication is optional but can be configured with the ppp authentication pap|chap Interface Subconfiguration mode command To build a local authentication table with usernames and passwords, use the username command If you have authentication problems, troubleshoot them with the debug ppp authentication command
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VPNs are becoming a common and inexpensive solution for providing protected connectivity across a public network VPN implementation types include site-to-site and remote access The most common VPN implementations are IPSec and SSL Cisco s remote access VPNs include Easy VPN for IPSec and WebVPN for SSL Easy VPN has two components: Server and Remote The Server centralizes policy configurations Cisco supports both hardware and software Remote devices IPSec is an open standard for implementing site-to-site and remote access VPNs It provides authentication, confidentiality, integrity, and anti-replay protection Protocols used to implement IPSec include ISAKMP, IKE, DH, AH, and ESP
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