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• dynamic allocation: A network administrator assigns a range of IP
addresses to DHCP, and each client computer on the LAN is
configured to request an IP address from the DHCP server during
network initialization. The request-and-grant process uses a lease
concept with a controllable time period, allowing the DHCP server
to reclaim (and then reallocate) IP addresses that are not renewed.
• automatic allocation: The DHCP server permanently a free IP address
to a requesting client from the range defined by the administrator.
This is like dynamic allocation, but the DHCP server keeps a table of
past IP address assignments, so that it can preferentially assign to
a client the same IP address that the client previously had.
• static allocation: The DHCP server allocates an IP address based on
a table with MAC address/IP address pairs, which are manually filled
in (perhaps by a network administrator). Only requesting clients with
a MAC address listed in this table will be allocated an IP address. This
feature (which is not supported by all DHCP servers) is variously
called Static DHCP Assignment (by DD-WRT),fixed-address (by the
dhcpd documentation), Address Reservation (by Netgear), DHCP
reservation or Static DHCP (by Cisco/Linksys), and IP reservation or
MAC/IP binding (by various other router manufacturers).
Diffie-Hellman
is that part of the
protocol used for exchanging the material from
which the symmetrical keys are built. The Diffie-Hellman algorithm
builds an encryption key known as a "shared secret" from the private
key of one party and the public key of the other. Since the
symmetrical keys are derived from this DH key shared between the
peers, at no point are symmetric keys actually exchanged.
Domain Name System
is a hierarchical distributed naming system for computers, services, or
any resource connected to the Internet or a private network. It
associates various information with domain names assigned to each
of the participating entities. A Domain Name Service resolves queries
for these names into IP addresses for the purpose of locating computer
services and devices worldwide. By providing a worldwide, distributed
keyword-based redirection service, the Domain Name System is an
essential component of the functionality of the Internet.
Encapsulating Security
Payload
is a member of the
protocol suite. In IPsec it provides origin
authenticity, integrity, and confidentiality protection of packets.
Fully Qualified Domain
Name
is a domain name that specifies its exact location in the tree hierarchy
of the
. It specifies all domain levels, including the
top-level domain and the root zone. A fully qualified domain name is
distinguished by its lack of ambiguity: it can be interpreted only in one
way.
Generic Routing
Encapsulation
is a tunneling protocol developed by Cisco Systems that can encapsulate
a wide variety of network layer protocols inside virtual point-to-point
links over an Internet Protocol network.
Hash Message
Authentication Code
is a specific construction for calculating a message authentication code
(MAC) involving a cryptographic hash function in combination with a
Command Reference Guide — Keenetic Lite (KN-1310)
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Glossary
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