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Appendix B: Glossary
Figure G-2. SC connector
SCEP Simple Certificate Enrollment Protocol. A Cisco protocol that, used with
LDAP, streamlines the process of acquiring a certificate from a CA. SCEP
allows network devices to be issued certificates automatically in a scalable
manner.
SCSI Small Computer Systems Interface. A parallel interface standard for attaching
peripheral devices to computers.
SDH Synchronous Digital Hierarchy. The signal hierarchy for fiber optic networks
outside of North America and Japan. SDH is a standard technology for
synchronous data transmission on optical media. Both SDH and SONET
technologies provide faster and less-expensive network interconnection than
traditional Plesiochronous Digital Hierarchy equipment. See also SONET.
SDLC Synchronous Data Link Control. The exclusive transport protocol for an SNA
network. A version of HDLC.
SDSL Symmetric DSL. A single-pair version of HDSL. SDSL is based on ISDN with
2B1Q, but is a symmetric DSL. SDSL provides bandwidth for downstream and
upstream traffic of up to 2.3 Mbps each. SDSL standards are not interoperable
and vary with the carrier.
Serial A connection between two devices over which information is transferred
FIFO, one bit at a time.
Session Layer Layer 5 of the OSI model. This layer establishes, manages and terminates
connections between applications. The Session Layer sets up, coordinates,
and terminates conversations, exchanges, and dialogues between the applica-
tions at each end. It allows information on different streams, perhaps origi-
nating from different sources, to be properly combined. In particular, the
Session Layer deals with synchronization issues.
SHA-1 Secure Hash Algorithm 1. A hash algorithm that produces a 160-bit message
digest, SHA-1 is improves on MD5, an earlier, still widely-used hash function.
In an IPSec VPN, AH can use SHA-1 to authenticate a packet.
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