Challenge-Handshake Authentication Protocol is one of the two main authentication protocols used to
verify a user's name and password for PPP Internet connections. CHAP is more secure because it
performs a three-way handshake during the initial link establishment between the home and remote
machines. It can also repeat the authentication anytime after the link has been established.
CIST
MSTP (Multiple Spanning Tree Protocol)
environment, Common and Internal Spanning Tree is a
single spanning tree domain that connects MSTP regions. The CIST is responsible for creating a loop-
free topology by exchanging and propagating
BPDU (Bridge Protocol Data Unit)
s across MSTP regions.
You can configure only one CIST on each switch.
CIST regional root bridge
MSTP (Multiple Spanning Tree Protocol)
region, the bridge with the lowest path cost to the
CIST (Common and Internal Spanning Tree)
root bridge is the CIST regional root bridge If the CIST root
bridge is inside an MSTP region, that same bridge is the CIST regional root for that region because it has
the lowest path cost to the CIST root. If the CIST root bridge is outside an MSTP region, all regions
connect to the CIST root through their respective CIST regional roots.
CIST root bridge
MSTP (Multiple Spanning Tree Protocol)
environment, the bridge with the lowest bridge ID
becomes the
CIST (Common and Internal Spanning Tree)
root bridge. The bridge ID includes the bridge
priority and the MAC address. The CIST root bridge can be either inside or outside an MSTP region. The
CIST root bridge is unique for all regions and non-MSTP bridges, regardless of its location.
CNP
Customer Network Port.
CoS
Class of Service specifies the service level for the classified traffic type.
CRC
Cyclic Redundancy Check is a simple checksum is designed to detect transmission errors. A decoder
calculates the CRC for the received data and compares it to the CRC that the encoder calculated, which
is appended to the data. A mismatch indicates that the data was corrupted in transit.
CVID
ID. The CVID represents the CVLAN tag for tagged
CVLAN
Customer
DCB
Data Center Bridging is a set of IEEE 802.1Q extensions to standard Ethernet, that provide an
operational framework for unifying Local Area Networks (LAN), Storage Area Networks (SAN) and
Inter-Process Communication (IPC) traffic between switches and endpoints onto a single transport
layer.
DHCP
Glossary
ExtremeSwitching 200 Series: Administration Guide
355