Cisco 7604 Configuration Guide - Page 720

Glossary SHA-1 SIP site-to-site VPN SKEME SMR SMTP SNMP split tunneling spoofing SQL*Net SSH SSL standby unit Secure Hash Algorithm 1. SHA-1 [NIS94c] is a revision to SHA that was published in 1994. SHA is closely modeled after MD4 and produces a 160-bit digest. Because SHA produces a 160-bit digest, it is more resistant to brute-force attacks than 128-bit hashes (such as MD5), but it is slower. Secure Hash Algorithm 1 is a joint creation of the National Institute of Standards and Technology and the National Security Agency. This algorithm, like other hash algorithms, is used to generate a hash value, also known as a message digest, that acts like a CRC used in lower-layer protocols to ensure that message contents are not changed during transmission. SHA-1 is generally considered more secure than MD5. Session Initiation Protocol. Enables call handling sessions, particularly two-party audio conferences, or "calls." SIP works with SDP for call signaling. SDP specifies the ports for the media stream. Using SIP, the FWSM can support any SIP VoIP gateways and VoIP proxy servers. A site-to-site VPN is established between two IPSec peers that connect remote networks into a single VPN. In this type of VPN, neither IPSec peer is the destination or source of user traffic. Instead, each IPSec peer provides encryption and authentication services for hosts on the LANs connected to each IPSec peer. The hosts on each LAN send and receive data through the secure tunnel established by the pair of IPSec peers. A key exchange protocol that defines how to derive authenticated keying material, with rapid key refreshment. Stub Multicast Routing. SMR allows the FWSM to function as a "stub router." A stub router is a device that acts as an IGMP proxy agent. IGMP is used to dynamically register specific hosts in a multicast group on a particular LAN with a multicast router. Multicast routers route multicast data transmissions to hosts that are registered to receive specific multimedia or other broadcasts. A stub router forwards IGMP messages between hosts and MC routers. Simple Mail Transfer Protocol. SMTP is an Internet protocol that supports email services. Simple Network Management Protocol. A standard method for managing network devices using data structures called Management Information Bases. Allows a remote VPN client simultaneous encrypted access to a private network and clear unencrypted access to the Internet. If you do not enable split tunneling, all traffic between the VPN client and the FWSM is sent through an IPSec tunnel. All traffic originating from the VPN client is sent to the outside interface through a tunnel, and client access to the Internet from its remote site is denied. A type of attack designed to foil network security mechanisms such as filters and access lists. A spoofing attack sends a packet that claims to be from an address from which it was not actually sent. Structured Query Language Protocol. An Oracle protocol used to communicate between client and server processes. Secure Shell. An application running on top of a reliable transport layer, such as TCP/IP, that provides strong authentication and encryption capabilities. Secure Sockets Layer. A protocol that resides between the application layer and TCP/IP to provide transparent encryption of data traffic. See secondary unit. GL-18 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01