3Com 3CRUS2475 User Manual page 315

314 A A: D
PPENDIX EVICE
Feature
Spanning Tree Protocol
SSH
SSL
Static MAC Entries
TACACS+
TCP
TFTP Trivial File Transfer Protocol
Traceroute
Virtual Cable Testing
VLAN Support
S F
PECIFICATIONS AND EATURES
Description
802.1d Spanning tree is a standard Layer 2 switch requirement that
allows bridges to automatically prevent and resolve L2 forwarding
loops. Switches exchange configuration messages using specifically
formatted frames and selectively enable and disable forwarding on
ports.
Secure Shell (SSH) is a protocol that provides a secure, remote
connection to a device. SSH version 2 is currently supported. The
SSH server feature enables an SSH client to establish a secure,
encrypted connection with a device. This connection provides
functionality that is similar to an inbound telnet connection. SSH
uses RSA and DSA Public Key cryptography for device connections
and authentication.
Secure Socket Layer (SSL) is an application-level protocol that
enables secure transactions of data through privacy, authentication,
and data integrity. It relies upon certificates and public and private
keys.
MAC entries can be manually entered in the Bridging Table, as an
alternative to learning them from incoming frames. These
user-defined entries are not subject to aging, and are preserved
across resets and reboots.
TACACS+ provides centralized security for validation of users
accessing the device. TACACS+ provides a centralized user
management system, while still retaining consistency with RADIUS
and other authentication processes.
Transport Control Protocol (TCP). TCP connections are defined
between 2 ports by an initial synchronization exchange. TCP ports
are identified by an IP address and a 16-bit port number. Octets
streams are divided into TCP packets, each carrying a sequence
number.
The device supports boot image, software and configuration
upload/download via TFTP.
Traceroute discovers IP routes that packets were forwarded along
during the forwarding process. The CLI Traceroute utility can be
executed from either the user-exec or privileged modes.
VCT detects and reports copper link cabling occurrences, such as
open cables and cable shorts.
VLANs are collections of switching ports that comprise a single
broadcast domain. Packets are classified as belonging to a VLAN
based on either the VLAN tag or based on a combination of the
ingress port and packet contents. Packets sharing common
attributes can be grouped in the same VLAN.