ZyXEL Communications ZyXEL ZyAIR A-6000 - Manual (Page 40)

A-6000 High Speed, Long Range Ethernet Wireless Bridge
CLI commands 5-2
Crossover
Ethernet cable A cable that wires a pin to its opposite pin, for example, RX+ is wired to TX+.
This cable connects two similar devices, for example, two data terminal
equipment (DTE) or data communications equipment (DCE) devices.
Cryptoanalysis The act of analyzing (or breaking into) secure documents or systems that are
protected with encryption.
Decryption The act of restoring an encrypted file to its original state.
Denial of Service Act of preventing customers, users, clients or other machines from
accessing data on a computer. This is usually accomplished by interrupting or
overwhelming the computer with bad or excessive information requests.
DHCP Dynamic Host Configuration Protocol automatically assigns IP addresses to
clients when they log on. DHCP centralizes IP address management on central
computers that run the DHCP server program. DHCP leases addresses for a
period of time which means that addresses are made available to assign to
other systems.
Digital Signature Digital code that authenticates whomever signed the document or software.
Software, messages, Email, and other electronic documents can be signed
electronically so that they cannot be altered by anyone else. If someone alters a
signed document, the signature is no longer valid. Digital signatures are created
when someone generates a hash from a message, then encrypts and sends
both the hash and the message to the intended recipient. The recipient decrypts
the hash and original message, makes a new hash on the message itself, and
compares the new hash with the old one. If the hashes are the same, the
recipient knows that the message has not been changed. Also see Public-key
encryption.
DNS Domain Name System. A database of domain names and their IP addresses.
DNS is the primary naming system for many distributed networks, including the
Internet.
Domain Name The unique name that identifies an Internet site. Domain Names always have 2
or more parts, separated by dots. The part on the left is the most specific, and
the part on the right is the most general.
DRAM Dynamic RAM that stores information in capacitors that must be refreshed
periodically.
DTE Originally, the DTE (data terminal equipment) meant a dumb terminal or printer,
but today it is a computer, or a bridge or router that interconnects local area
networks.
EMI ElectroMagnetic Interference. The interference by electromagnetic signals that
can cause reduced data integrity and increased error rates on transmission
channels.
Encryption The act of substituting numbers and characters in a file so that the file is
unreadable until it is decrypted. Encryption is usually done using a
mathematical formula that determines how the file is decrypted.
Ethernet A very common method of networking computers in a LAN. There are a number
of adaptations to the IEEE 802.3 Ethernet standard, including adaptations with
data rates of 10 Mbits/sec and 100 Mbits/sec over coaxial cable, twisted-pair
cable, and fiber-optic cable. The latest version of Ethernet, Gigabit Ethernet,
has a data rate of 1 Gbit/sec.
Events These are network activities. Some activities are direct attacks on your system,
while others might be depending on the circumstances. Therefore, any activity,
regardless of severity is called an event. An event may or may not be a direct
attack on your system.
FCC The FCC (Federal Communications Commission) is in charge of allocating the
electromagnetic spectrum and thus the bandwidth of various communication
systems.
Firewall A hardware or software "wall" that restricts access in and out of a network.
Firewalls are most often used to separate an internal LAN or WAN from the
Internet.