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CCNA > General > Flashcards

General Flashcards

1
Q

Use straight thru cables

A

Switch to router
Computer to switch
Computer to hub

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2
Q

Use crossover cable

A 
Switch to switch
Switch to hub
Hub to hub
Router to router
Computer to computer
Computer to router
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3
Q

Access layer

A

Provides local and remote user access

Controls which devices are allowed to communicate on the network

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4
Q

Distribution layer

A

Controls flow of data between access and core layers

Delineates broadcast domains by performing routing functions between VLANs defined at access layer

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5
Q

Core layer

A

High speed backbone

Highly available and redundant

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6
Q

Work area

A

Locations of end devices used by individual

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7
Q

Telecommunications room

A

Where connections to intermediary devices take place

House hubs, switches, routers, and data service

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8
Q

Horizontal cabling

A

Cables connecting the telecommunications rooms with the work areas

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9
Q

Backbone cabling

A

Cabling used to connect the telecommunication rooms with the equipment rooms

Interconnects LANs between buildings

Aggregated traffic

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10
Q

Network diameter

A

Number of devices a packet has to cross before destination

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11
Q

CPE

A

Customer premises equipment

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12
Q

DCE

A

Data-circuit-terminating equipment

Puts data on local loop

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13
Q

DTE

A

Data terminal equipment

Carrier equipment connects subscriber to the WAN

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14
Q

Local loop

A

Cable that connects the CPE to the central office

Last mile

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15
Q

Demarcation point

A

Connects CPE to local loop

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16
Q

CSU/DSU

A

Channel service unit(CSU) provides termination for digital signal, error correction, and monitoring

Data service unit(DSU) concerts t-carrier line frames into frames the LAN Can read and vice versa

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17
Q

WAN data link protocols

A 
HDLC
point-to-point protocol
Frame relay
ATM
MPLS
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18
Q

Network documentation

A

Should include

  • network topology diagram
  • network configuration table
  • end system configuration table
  • network baseline
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19
Q

User exec mode

A

Access to limited number of basic monitoring and troubleshooting commands, such as show and ping

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20
Q

Privileged exec mode

A

Full access to all device commands, including configuration and managememt

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21
Q

Up arrow or ctrl-p

A

Go back thru command history

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22
Q

Up arrow or ctrl-n

A

Go forward in command history

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23
Q

Typing tab in CLI

A

Auto completes a partial command entry

24
Q

Command to enter global configuration mode

A

Configure terminal

25
Q

Login command

A

Requires password to be entered

26
Q

Enable secret

A

Creates password and stores it encrypted

27
Q

service password-encryption command

A

Encrypts all passwords in configuration file

28
Q

transport input ssh command

A

Entered in line configuration mode

Only allows SSH telnet connections

29
Q

General troubleshooting method

A

Step 1: analyzing/predicting normal operation
Step 2: problem/solution
Step 3: root cause analysis

30
Q

Use ping to test connectivity

A
  • can device ping itself
  • can device ping default gateway
  • can device ping the destination
31
Q

when DHCP server is on a different LAN

A

enter ip helper-address command followed by address of server on router interface for separate LANs

32
Q

DNS A record

A

an end device address

33
Q

DNS NS record

A

an authoritative name server

34
Q

DNS CNAME record

A

the canonical name ( or fully qualified domain name) for an alias

35
Q

DNS MX record

A

mail exchange record

maps a domain name to a list of mail exchange servers

36
Q

in IPv6 what is analogous to a subnet mask

A

prefix

-if prefix length is not on quartet boundary write down value for entire quartet

37
Q

how to abbreviate IPv6 address

A
  • omit leading 0s in any given quartet

- represent 1 or more consecutive quartets of all hex 0s w/ a double colon (::), but only for one such occurence

38
Q

show filesystems content

A

dir command

39
Q

cisco filesystem URL structure

A

prefix[//location]/directory]/filename]

40
Q

boot system command

A

can be used to specify which ios image to boot from

41
Q

recover lost cisco password

A
  • turn off router
  • press break key
  • enter confreg 0x2142
  • enter reset
  • skip initial config
  • copy startup-config running-config
  • enter enable secret for new password
  • enter config-register 0x2102
  • copy run start
  • verify config
42
Q

dynamic NAT

A

uses a pool of public addresses and assigns them on a first come first serve basis. when a host with a private ip requires access to the internet, dynamic NAT chooses an ip from the pool thats not already in use by another host

43
Q

static NAT

A

uses a 1 to 1 mapping of local and global addresses, useful for web servers or hosts that need a consistent internet address

44
Q

NAT overload

A

aka port address translation (PAT)

maps multiple private IPs to a single public ip or a few addresses

each private address is tracked by a port #

45
Q

configure static NAT

A

ip nat inside source static local-ip global-in

specify interface w/ ip nat inside command

specify outside interface w/ip nat outside

46
Q

configure dynamic NAT

A 
1)define pool of global address
#ip nat pool *name start-ip end-ip {netmask *netmask*| prefix-length *prefix length*}
2) define standard ACL permitting addresses to be translated 
3)bind  pool of addresses to ACL
4)specify interfaces
47
Q

configure NAT overload

A

ip nat inside source list ACL# interface interface# overload

48
Q

NAT show commands

A

show ip nat translations

show ip nat statistics

49
Q

reset dynamic nat

A

clear ip nat translation

50
Q

troubleshooting NAT

A

1) based on config, clearly define what NAT is supposed to achieve
2) verify correct translations exist in the translation table using show ip nat translations
3) use clear and debug commands
4) review in detail what is happening to packet

51
Q

use ping to test connectivity

A

can device ping itself?

can device ping default gateway?

can device ping the destination?

52
Q

100BASE-TX

A

cat 5UTP

53
Q

100BASE-FX

A

multimode fiber

54
Q

1000BASE-SX

A

single mode fiber

55
Q

1000BASE-LX

A

multi mode fiber

56
Q

terminal settings for pc to device via console port

A 
Speed: 9600 b/s
Data bits: 8
Parity: None
Stop bit: 1
Flow control: None
57
Q

command to view open ports on switch/router

A

show control-plane host open-ports

CCNA (12 decks)

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