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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
Login command
Requires password to be entered
26
Enable secret
Creates password and stores it encrypted
27
**service password-encryption** command
Encrypts all passwords in configuration file
28
**transport input ssh** command
Entered in line configuration mode Only allows SSH telnet connections
29
General troubleshooting method
Step 1: analyzing/predicting normal operation Step 2: problem/solution Step 3: root cause analysis
30
Use ping to test connectivity
- can device ping itself - can device ping default gateway - can device ping the destination
31
when DHCP server is on a different LAN
enter ip helper-address command followed by address of server on router interface for separate LANs
32
DNS A record
an end device address
33
DNS NS record
an authoritative name server
34
DNS CNAME record
the canonical name ( or fully qualified domain name) for an alias
35
DNS MX record
mail exchange record maps a domain name to a list of mail exchange servers
36
in IPv6 what is analogous to a subnet mask
prefix -if prefix length is not on quartet boundary write down value for entire quartet
37
how to abbreviate IPv6 address
- 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
show filesystems content
dir command
39
cisco filesystem URL structure
prefix[//location]/directory]/filename]
40
boot system command
can be used to specify which ios image to boot from
41
recover lost cisco password
- 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
dynamic NAT
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
static NAT
uses a 1 to 1 mapping of local and global addresses, useful for web servers or hosts that need a consistent internet address
44
NAT overload
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
configure static NAT
ip nat inside source static local-ip global-in specify interface w/ ip nat inside command specify outside interface w/ip nat outside
46
configure dynamic NAT
``` 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
configure NAT overload
ip nat inside source list *ACL#* interface *interface#* overload
48
NAT show commands
show ip nat translations | show ip nat statistics
49
reset dynamic nat
clear ip nat translation
50
troubleshooting NAT
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
use ping to test connectivity
can device ping itself? can device ping default gateway? can device ping the destination?
52
100BASE-TX
cat 5UTP
53
100BASE-FX
multimode fiber
54
1000BASE-SX
single mode fiber
55
1000BASE-LX
multi mode fiber
56
terminal settings for pc to device via console port
``` Speed: 9600 b/s Data bits: 8 Parity: None Stop bit: 1 Flow control: None ```
57
command to view open ports on switch/router
show control-plane host open-ports

CCNA (12 decks)

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