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CISCO CCNA > Chap2er 1-4 > Flashcards

Chap2er 1-4 Flashcards

Sem 2 Chap 1-4

1
Q

Switch recieves frame w unknown dest address. What happens?

A

Adds source MAC to table, forwards out of all ports except ingress

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2
Q

Switch component that reduces packet handling time

A

ASIC

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3
Q

Switching method that ensures frame is error-free

A

store-and-forward

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4
Q

Switching method without error checking

A

cut-through

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5
Q

What are frame forwarding decisions based on

A

MAC address and port mappings in CAM table

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6
Q

Difference between hub and switch

A

hub extends collision domain, switch divides collision domains

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7
Q

How many broadcast domains? (4 routers connected to hosts, each connected to a central router)

A

8

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8
Q

What impact does adding a switch have on a network

A

increases size of broadcast domain

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9
Q

How do switch buffers affect network performance

A

Store frames received, prevents premature frame discarding

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10
Q

Switch characteristic that keeps network local and alleviates network congestion

A

high port density

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11
Q

What happens when a device in a VLAN sends a broadcast frame

A

only devices in that VLAN see the frame

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12
Q

Characteristics of the native VLAN

A

traffic is untagged across the trunk, provides a common identifier to both ends of the trunk

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13
Q

VLAN designed to have <150ms delay

A

voice VLAN

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14
Q

VLAN used to separate networks into groups of users/devices

A

data VLAN

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15
Q

VLAN configured for SSH/Telnet/HTTPS/HTTP/SMTP

A

management VLAN

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16
Q

VLAN used to designate which traffic is untagged

A

native VLAN

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17
Q

VLAN type

A

a value for the tag protocol id value

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18
Q

VLAN ID

A

a VLAN number

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19
Q

VLAN User priority

A

a value that supports level or service implementation (QoS)

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20
Q

VLAN canonical format identifier

A

identifier that enables token ring frames to be carried across ethernet links

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21
Q

T/F: The command to assign a voice VLAN is switchport access vlan

A

FALSE

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22
Q

Four steps to configure voice VLAN

A

Add voice vlan, configure switch port in access mode, Assign voice vlan to source port, ensure voice traffic is trusted and tagged with CoS priority value

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23
Q

Output of show vlan brief

A

VLAN assignment and membership for all switch ports

24
Q

Impact of no switchport access command

A

port is returned to vlan 1

25
What happens to switch ports after the VLAN to which they are assigned is deleted
ports stop communicating with the attached devices (the twilight zone)
26
Command to display encapsulation type, voice VLAN ID, and access mode VLAN for Fa0/1
show int Fa0/1 switchport
27
Why would interfaces be missing from show vlan brief
they're configured as trunks
28
To be available, an interface must be
configured with an ip, manually activated
29
After which step of the switch bootup sequence is the boot loader executed
after POST execution
30
What does a switch use to locate and load the IOS image?
BOOT environment variable
31
Command used to set BOOT environment variable
boot system
32
Effect of "ip address" in interface config of switch
applies ipv4 address to virtual interface
33
If one end of ethernet is full-duplex and the other is half-duplex, where will collisions occur
at the half-duplex end
34
Command that displays info abt auto-mdix
show controllers
35
Runt frames are frames that are less than ___ bytes
64
36
T/F: The transport input all command will only allow ssh connections
FALSE
37
In order to be available, an interface must be
configured with at least one ip, activated with no shut
38
Characteristic of IPV4 loopback interface
logical interface internal to the router
39
DTP dynamic desirable
actively attempts to convert the link into a trunk
40
DTP dynamic auto
passively waits for neighbor to initiate trunking
41
DTP nonegociate
requires manual config of trunking/non-trunking
42
DTP trunk
permanent trunking mode
43
What mode should the router port be in if Cisco best practices are being used
trunk
44
Under what occasions should an admin disable DTP
when connecting cisco switch to non-cisco switch, on links that should not be trunking
45
Refer to the infographic where the workstations are on vlan 20. What is the problem
allow vlan 20 on the trunk link
46
Disadvantages of router-on-a-stick
dedicated router required, lower traffic flow speed
47
Correct statements regarding layer 3 switches (SVI inter-vlan)
switching packets is faster, no need for connection with router
48
What is required for communication between vlans (router-on-a-stick topology)
switch with router port configured as a trunk
49
What does in encapsulation dotiq mean
VLAN number
50
What command allows inter-vlan routing on a router
switchport mode trunk
51
What is the cause of the error "Configuring IP routing on a LAN… 802.1Q, or ISL VLAN"
missing encapsulation dot1q <>
52
What's the problem in the exhibit with vlans 20,30, and 40 on RT1?
IP on sub-interfaces are incorrectly matched to VLANs
53
What kind of port is required for inter-vlan routing
trunk port
54
Characteristic of routed port on L3 switch
not assigned to a VLAN
55
What does in encapsulation dot1q mean
VLAN number
56
Problems in Gi1/1 exhibit
Gi1/1 is the default VLAN, Gi1/1 is configured as a turnk
57
How to do packet tracer
fix router-on-a-stick

CISCO CCNA (3 decks)

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