KTI Networks KGS-2421 Uživatelský manuál stáhnout pdf (Strana 106)

this information to implement IP address or other assignment policies.

Specifically the option works by setting two sub-options: Circuit ID (option 1)

and Remote ID (option2). The Circuit ID sub-option is supposed to include

information specific to which circuit the request came in on. The Remote ID

sub-option was designed to carry information relating to the remote host end of

the circuit.

The definition of Circuit ID in the switch is 4 bytes in length and the format is

"vlan_id" "module_id" "port_no". The parameter of "vlan_id" is the first two

bytes represent the VLAN ID. The parameter of "module_id" is the third byte for

the module ID (in standalone switch it always equal 0, in stackable switch it

means switch ID). The parameter of "port_no" is the fourth byte and it means the

port number.

The Remote ID is 6 bytes in length, and the value is equal the DHCP relay

agent¡¦s MAC address.

DHCP Snooping

DHCP Snooping is used to block intruder on the untrusted ports of DUT when it

tries to intervene by injecting a bogus DHCP reply packet to a legitimate

conversation between the DHCP client and server.

DNS

DNS is an acronym for Domain Name System. It stores and associates many

types of information with domain names. Most importantly, DNS translates

human-friendly domain names and computer hostnames into computer-friendly

IP addresses. For example, the domain name www.example.com might translate

to 192.168.0.1.

DoS

DoS is an acronym for Denial of Service. In a denial-of-service (DoS) attack, an

attacker attempts to prevent legitimate users from accessing information or

services. By targeting at network sites or network connection, an attacker may

be able to prevent network users from accessing email, web sites, online

accounts (banking, etc.), or other services that rely on the affected computer.

Dotted Decimal Notation

Dotted Decimal Notation refers to a method of writing IP addresses using

decimal numbers and dots as separators between octets.

An IPv4 dotted decimal address has the form x.y.z.w, where x, y, z, and w are

decimal numbers between 0 and 255.

DSCP

DSCP is an acronym for Differentiated Services Code Point. It is a field in the

header of IP packets for packet classification purposes.

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KTI Networks KGS-2421 Uživatelský manuál Strana 106