TMS zl Management and Configuration Guide ST.1.1.100430

B-8
Glossary
DHCP Dynamic Host Configuration Protocol. A protocol that allows network
administrators to set up a server to manage IP addresses, automatically
assigning IP addresses to devices on the network. DHCP simplifies IP man-
agement, eliminating the need to manually assign IP addresses to devices and
then track those addresses.
DHCP relay DHCP relay passes DHCP requests from clients on one subnetwork to a DHCP
server on a different subnetwork, eliminating the need for a DHCP server on
each network segment.
dial-in user The remote L2TP VPN client to whom you want to permit access.
Differentiated
Services
Also known as DiffServ, a class of service model that enhances the best-effort
services of the Internet by differentiating traffic according to user, service
requirements, and other criteria.
Differentiated
Services code
point
See DSCP.
Differentiated
Services field
The IP header field (DS) that is used as a codepoint to select the PHB.
Diffie-Hellman
group
Determines the length of the base prime number used during a Diffie-Hellman
key exchange.
Diffie-Hellman key
exchange
A key exchange method that generates the actual keys during the second
exchange of IKE phase 1. The Diffie-Hellman Key Agreement Protocol is a
secure method for generating unique, shared keys without sending them over
the connection, which would render them vulnerable to interception.
Diff-Serv See Differentiated Services.
Digital Signature
Algorithm
See DSA.
Dijkstra’s
algorithm
A routing algorithm developed by Dutch computer scientist Edsger Dijkstra
that allows routers to generate a routing tree with itself as the root. So all
routes on the tree are the shortest path between the router and the destination
node.
distinguished
encoding rules
See DER.
distinguished
name
See DN.