D-Link DSR-500N User Manual download pdf (Page 198)

Unified Services Router User Manual

196

Appendix A. Glossary

ARP

Address Resolution Protocol. Broadcast protocol for mapping IP addresses to MAC addresses.

CHAP

Challenge-Handshake Authentication Protocol. Protocol for authenticating users to an ISP.

DDNS

Dynamic DNS. System for updating domain names in real time. Allow s a domain name to be

assigned to a device w ith a dynamic IP address.

DHCP

Dynamic Host Configuration Protocol. Protocol for allocating IP addresses dynamically so that

addresses can be reused w hen hosts no longer need them.

DNS

Domain Name System. Mechanism for translating H.323 IDs, URLs, or e-mail IDs into IP

addresses. Also used to assist in locating remote gatekeepers and to map IP addresses to

hostnames of administrative domains.

FQDN

Fully qualified domain name. Complete domain name, including the host portion. Example:

serverA.companyA.com.

FTP

File Transfer Protocol. Protocol for transferring files between network nodes.

HTTP

Hypertext Transfer Protocol. Protocol used by w eb browsers and web servers to transfer files.

IKE

Internet Key Exchange. Mode for securely exchanging encryption keys in ISAKMP as part of

building a VPN tunnel.

IPsec

IP security. Suite of protocols for securing VPN tunnels by authenticating or encrypting IP

packets in a data stream. IPsec operates in either transport mode (encrypts payload but not

packet headers) or tunnel mode (encrypts both payload and packet headers).

ISAKMP

Internet Key Exchange Security Protocol. Protocol for establishing security associations and

cryptographic keys on the Internet.

ISP

Internet service provider.

MAC Address

Media-access-control address. Unique physical-address identifier attached to a netw ork

adapter.

MTU

Maximum transmission unit. Size, in bytes, of the largest packet that can be passed on. The

MTU for Ethernet is a 1500-byte packet.

NAT

Netw ork Address Translation. Process of rewriting IP addresses as a packet passes through a

router or firew all. NAT enables multiple hosts on a LAN to access the Internet using the single

public IP address of the LAN’s gatew ay router.

NetBIOS

Microsoft Window s protocol for file sharing, printer sharing, messaging, authentication, and

name resolution.

NTP

Netw ork Time Protocol. Protocol for synchronizing a router to a single clock on the netw ork,

know n as the clock master.

PAP

Passw ord Authentication Protocol. Protocol for authenticating users to a remote access server

or ISP.

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