CCENT Concepts Pt. 8 Flashcards Preview

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Flashcards in CCENT Concepts Pt. 8 Deck (20):
1

show port-security interface type
number

Lists an interface's port security
configuration settings and security
operational status.

2

CDP discovers several useful
details from the neighboring Cisco
devices:

Device Identifier, Address list, Local
interface, Port Identifier, Capabilities
list, Platform

3

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.

4

show cdp neighbors detail

Lists one large set (approximately 15
lines) of information, one set for every
neighbor.

5

show cdp entry name

Lists the same information as the show
cdp neighbors detail command, but
only for the named neighbor (casesensitive).

6

Excessive noise

Symptoms - many input errors, few
collisions
Causes - Wrong cable category (Cat 5,
5e, 6): damaged cabled; EMI

7

Collisions

Symptoms - More than roughly .1% of
all frames are collisions
Causes - Duplex mismatch (seen on
the half-duplex side); jabber; Dos

8

late Collisions

Symptoms - Increasing late collisions
Causes - Collisions domain or single
cable too long; duplex mismatch

9

CDP neighbor

A device on the other end of some
communications cable that is
advertising CDP updates

10

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.

11

error disabled

An interface state on LAN switches
that is the result of one of many
security violations

12

ITU-R

Worldwide standardization of
communications that use radiated
energy, particularly managing the
assignment of frequencies

13

IEEE

Standardization of wireless LANs
(802.11)

14

Wi-Fi Alliance

An industry consortium that
encourages interoperability of products
that implement WLAN standards
through their Wi-Fi certified program.

15

Federal Communications
Commission (FCC)

The U.S. government agency with that
regulates the usage of various
communications frequencies in the
U.S.

16

Direct Sequences Spread
Spectrum (DSSS)

(802.11)

17

Orthogonal Frequency Division
Multiplexing (OFDM)

(802.11b, 802.11g)

18

Frequency Hopping Spread
Spectrum (FHSS)

(802.11a, 802.11g)

19

Physical Installation of a router

Connect any LAN cables to the LAN ports.
If using an external CSU/DSU, connect the router's serial interface to the
CSU/DSU, and the CSU/DSU to the line from the telco.
If using an internal CSU/DSU, connect the router's serial interface to the line
from the telco.

20

Differences between Switch CLI
and Router CLI

The configuration of IP addresses differs in some ways.
The questions asked in setup mode differ.
Routers have an auxiliary (Aux) port, intended to be connected to an external
modem and phone line, to allow remote users to dial into the router, and
access the CLI, by making a phone call.