CCNA:ICND2 vocab - sec 4
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Challenge Handshake Authentication Protocol. A security feature defined by PPP that allows either or both endpoints on a link to authenticate the other device as a particular authorized device
IP control protocol (IPCP)
A control protocol defined as part of PPP for the purpose of initializing and controlling the sending of IPv4 packets over a PPP link.
A feature of many data-link protocols in which the router sends messages periodically to let the neighboring router know that the first router is still alive and well
Link Control Protocol (LCP)
A control protocol defined as part of PPP for the purpose of initializing and maintaining a PPP link.
Password Authentication Protocol. A PPP authentication protocol that allows PPP peers to authenticate one another
In Frame Relay, the physical serial link that connects a Frame Relay DTE, usually a router, to a Frame Relay switch. The access link uses the same physical layer standards as do point-to-point leased lines.
In Frame Relay, the speed at which bits are sent over an access link
Committed Information Rate (CIR)
In Frame Relay and ATM, the average speed at which bits can be transferred over a virtual circuit according to the business contract between the customer and the service provider.
data-link connection identifier (DLCI)
The Frame Relay address that identifies a VC on a particular access link
Frame Relay DCE
The Frame Relay switch
Frame Relay DTE
The customer device connected to a Frame Relay access link, typically a router
Frame Relay mapping
The information that correlates, or maps, a Frame Relay DLCI to the Layer 3 address of the DTE on the other end of the VC identified by the local DLCI
A Frame Relay protocol with which a router announces its Layer 3 address over a VC, thereby informing the neighbor of useful Layer-3-to-Layer-2 mapping information
Local Management Interface (LMI)
A Frame Relay protocol used between a DTE (router) and DCE (Frame Relay Switch). LMI acts as a keepalive mechanism. The absence os LMI messages means that the other device has failed. It also tells the DTE about the existence of each VC and DLCI, along with its status.
nonbroadcast multiaccess (NBMA)
A characterization of a type of Layer 2 network in which more than two devices connect to the network, but the network does not allow broadcast frames to be sent to all devices on the network.
permanent virtual circuit (PVC)
A preconfigured communications path between two Frame Relay DTEs, identified by a local DLCI on each Frame Relay access link, that provides the functional equivalent of a leased circuit, but without a physical leased line for each VC.
virtual circuit (VC)
A logical concept that represents the path that frames travel between DTEs. VCs are particularly useful when comparing Frame Relay to leased physical circuits.
Diffie-Hellman key exchange
A key exchange protocol in which two devices can exchange information over a public network. Combined with some preexisting secrets, this allows them to calculate a symmetric key known only to them
The term referring to the IP Security Protocols, which is an architecture for providing encryption and authentication services, typically when creating VPN services through an IP network.
A reference to a security key whose value is known by both the sender and receiver.
Secure Socket Layer. A security protocol that is integrated into commonly used web browsers that provides encryption and authentication services between the browser and a website.
Virtual Private Network. A set of security protocols that, when implemented by two devices on either side of an unsecured network such as the Internet, can allow the devices to send data securely. VPNs provide privacy, device authentication, anti-replay services, and data integrity services.
Software that resides on a PC, often a laptop, so that the host can implement the protocols required to be an endpoint of a VPN
A tool offered by Cisco in which a user can use any common we browser to securely connect using SSL to a web VPN server, which then connects to the user's Enterprise web-based applications--applications that may or may not support SSL
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