User guide

Glossary 435
HTTP
HyperText Transport Protocol. Transmits HTML
documents between servers and clients on the
internet.
I
IC
Integrated Circuit. Integrated Circuits are small
electronic devices composed from semiconductor
material.
ICMP
Internet Control Message Protocol. Allows gateway or
destination host to communicate with a source
host, for example, to report a processing error.
IEEE
Institute of Electrical and Electronics Engineers.
An Engineering organization that develops
communications and networking standards.
IEEE 802.1d
Used in the Spanning Tree Protocol, IEEE 802.1d
supports MAC bridging to avoid network loops.
IEEE 802.1p
Prioritizes network traffic at the data-link/MAC
sublayer.
IEEE 802.1Q
Defines the operation of VLAN Bridges that permit
the definition, operation, and administration of
VLANs within Bridged LAN infrastructures.
Image File
System images are saved in two Flash sectors called
images (Image 1 and Image 2). The active image
stores the active copy; while the other image stores a
second copy.
Ingress Port
Ports on which network traffic is received.
IP
Internet Protocol. Specifies the format of packets
and there addressing method. IP addresses packets
and forwards the packets to the correct port.
IP Address
Internet Protocol Address. A unique address assigned
to a network device with two or more
interconnected LANs or WANs.
IP Version 6 (IPv6)
A version of IP addressing with longer addresses
than the traditional IPv4. IPv6 addresses are 128 bits
long, whereas IPv4 addresses are 32 bits; allowing a
much larger address space.
IPX
Internetwork Packet Exchange. Transmits
connectionless communications.
ISATAP
Intra-Site Automatic Tunnel Addressing Protocol .
ISATAP is an automatic overlay tunneling
mechanism that uses the underlying IPv4 network
as a non-broadcast/multicast access link layer for
IPv6. ISATAP is designed for transporting
IPv6 packets within a site where a native
IPv6 infrastructure is not yet available.