By conventional definition, a firewall is a partition made of fireproof material designed to prevent the spread of fire from one part of a building to another. It can be used to isolate one compartment from another. When applying the term firewall to a computer network (or to a Local Area Network – LAN), a […]
[Continue reading]Configuring Cisco Firewall Security Contexts
Starting with Cisco Firewall version 7.x and upwards, the PIX and ASA Cisco firewalls can support now multiple contexts (or virtual firewalls) on the same physical chassis unit. Each security context runs independently with its own set of security policies, access rules, logging configuration, and so on. Out of the box, any cisco firewall appliance […]
[Continue reading]Most Common Networking Terms and Acronyms – P
p2mp point-to-multipoint. Communication between a series of receivers and transmitters to a central location. Cisco p2mp typically is set up in three segments to enable frequency re-use. Cisco offers MMDS, U-NII, and LMDS systems in p2mp. p2p point-to-point. Communication between one receiver and one location. P2p has a higher bandwidth than p2mp for reasons including […]
[Continue reading]Most Common Networking Terms and Acronyms – O
OAKLEY Key establishment protocol (proposed for IPsec but superseded by IKE) based on the Diffie-Hellman algorithm and designed to be a compatible component of ISAKMP. OC optical carrier. Series of physical protocols (OC-1, OC-2, OC-3, and so on), defined for SONET optical signal transmissions. OC signal levels put STS frames onto multimode fiber-optic line at […]
[Continue reading]Most Common Networking Terms and Acronyms – N
NAK negative acknowledgment. Response sent from a receiving device to a sending device indicating that the information received contained errors. name server Server connected to a network that resolves network names into network addresses. NAS network access server. A platform (or collection of platforms, such as an AccessPath system) that interfaces between the packet world […]
[Continue reading]Most Common Networking Terms and Acronyms – M
MAC Media Access Control. Lower of the two sublayers of the data link layer defined by the IEEE. The MAC sublayer handles access to shared media, such as whether token passing or contention will be used. MAC address Standardized data link layer address that is required for every port or device that connects to a […]
[Continue reading]Most Common Networking Terms and Acronyms – L
L2F Protocol Layer 2 Forwarding Protocol. Protocol that supports the creation of secure virtual private dial-up networks over the Internet. L2TP session Communications transactions between the LAC and the LNS that support tunneling of a single PPP connection. There is a one-to-one relationship among the PPP connection, L2TP session, and L2TP call. LAC L2TP access […]
[Continue reading]Most Common Networking Terms and Acronyms – K
Kerberos Developing standard for authenticating network users. Kerberos offers two key benefits: it functions in a multivendor network, and it does not transmit passwords over the network. key distribution Process that delivers a cryptographic key from the location where it is generated to the locations where it is used in a cryptographic algorithm. key establishment […]
[Continue reading]Most Common Networking Terms and Acronyms – J
jitter The interpacket delay variance; that is, the difference between interpacket arrival and departure. Jitter is an important QoS metric for voice and video applications. JPEG Joint Photographics Expert Group. Graphic file format that was adopted as a standard by the ITU-T and the ISO. JPEG most often is used to compress still images using […]
[Continue reading]Most Common Networking Terms and Acronyms – I
IANA Internet Assigned Numbers Authority. Organization operated under the auspices of the ISOC as a part of the IAB. IANA delegates authority for IP address–space allocation and domain-name assignment to the InterNIC and other organizations. IANA also maintains a database of assigned protocol identifiers used in the TCP/IP stack, including autonomous system numbers. ICMP Internet […]
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