CCENT Concepts Pt. 8 Flashcards
show port-security interface type
number
Lists an interface’s port security
configuration settings and security
operational status.
CDP discovers several useful
details from the neighboring Cisco
devices:
Device Identifier, Address list, Local
interface, Port Identifier, Capabilities
list, Platform
show cdp neighbors [type number]
Lists one summary line of information
about each neighbor or just the
neighbor found on a specific interface
if an interface was listed.
show cdp neighbors detail
Lists one large set (approximately 15
lines) of information, one set for every
neighbor.
show cdp entry name
Lists the same information as the show
cdp neighbors detail command, but
only for the named neighbor (casesensitive).
Excessive noise
Symptoms - many input errors, few
collisions
Causes - Wrong cable category (Cat 5,
5e, 6): damaged cabled; EMI
Collisions
Symptoms - More than roughly .1% of
all frames are collisions
Causes - Duplex mismatch (seen on
the half-duplex side); jabber; Dos
late Collisions
Symptoms - Increasing late collisions
Causes - Collisions domain or single
cable too long; duplex mismatch
CDP neighbor
A device on the other end of some
communications cable that is
advertising CDP updates
up and up
Jargon referring to the two interface states on a Cisco IOS router or switch
(line status and protocol status), with the first “up” referring to the line status,
and the second “up” referring to the protocol status. An interface in this state
should be able to pass data-link frames.
error disabled
An interface state on LAN switches
that is the result of one of many
security violations
ITU-R
Worldwide standardization of
communications that use radiated
energy, particularly managing the
assignment of frequencies
IEEE
Standardization of wireless LANs
802.11
Wi-Fi Alliance
An industry consortium that
encourages interoperability of products
that implement WLAN standards
through their Wi-Fi certified program.
Federal Communications
Commission (FCC)
The U.S. government agency with that
regulates the usage of various
communications frequencies in the
U.S.
