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Routing > Module 1-3 SG > Flashcards

Module 1-3 SG Flashcards

1
Q

Give the steps of the switch boot sequence

A

Five-step boot sequence.
1. Loads a POST program stored in ROM
2. Loads the boot loader software.
3. Boot loader performs low-level CPU initialization
4. Boot loader initializes flash file system on system board
5. Boot loader locates and loads a default IOS operating system image into memory and give control of switch to the IOS.

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2
Q

In what part of the Cisco device is the startup config stored

A

Located in the flash. File is called config.text

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3
Q

Give the steps necessary to recover from a system crash on a switch including the syntax issued at the switch prompt

A

5 Step process.
1. connect a pc by console cable to switch console. configure terminal software to connect to switch
2. unplug switch power cord
3. reconnect power cord to the switch, then within 15 seconds press and hold down mode buttom while system LED is flashing green
4. continue pressing mode until system led turns briefly amber then solid green. release mode button
5. boot loader switch: prompt appears in the terminal emulation software on the pc.

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4
Q

Define Switched Virtual Interface (SVI)

A

SVI is a virtual interface, but can be configured similar to a physical port.

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5
Q

For what is the SVI used?

A

For switch management configuration. Provides IP connection for switych and can be used to route traffic on a layer 3 switch.

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6
Q

Give the command syntax to configure an SVI

A

S1(config)#interface vlan <vlan>
S1(config-if)#ip address <ip> <mask></mask></ip></vlan>

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7
Q

Explain the difference in full and half duplex

A

Full-duplex increases bandwidth efficiency by allowing both ends of a conenction to send and receive data at the same time.
Half-duplex is unidirectional, so data can only flow in one direction at a time. This results in collisions and performance issues.

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8
Q

What is Auto-MDIX

A

automatic medium-dependent interface crossover. when enabled, switch interface automatically detects the required cable connection type and configures the connection appropriately.

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9
Q

Which cables are detected with Auto MDIX

A

straight-through or crossover.

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10
Q

Which show command verifies Layers 1 and 2 are operational

A

show interfaces

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11
Q

Explain Runt frames, Giants, and CRC errors

A

runt frame, ethernet frames that are shorter than the 64-byte minimum allowed length. usually caused by collisions or malfunctioning NICs.
giants, frame larger than the maximum allowed size.
CRC errors, on ethernet and serial interfaces, usually indicate a media or cable error.

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12
Q

Write the commands to configure a switchport for duplex speed and autosensing the cable Start in global config

A

S1(config)# interface FastEthernet 0/1
Configure the interface duplex. S1(config-if)# duplex full
Configure the interface speed. S1(config-if)# speed 100

S1(config)# interface FastEthernet 0/1
S1(config-if)#mdix auto

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13
Q

Why is telnet no longer used Why is it insecure

A

Older protocol that uses unsecure plaintext transmissions of both login authentication and data transmitted between communicating devices.

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14
Q

What are the TCP port numbers for telnet and ssh

A

ssh 22, telnet 23

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15
Q

How can you verify if a switch supports SSH

A

show version command. If combination includes “k9” it supports encryption. or show ip ssh command.

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16
Q

Give all the steps and configuration syntax required to set up SSH on a switch

A

6 steps.
1. verify ssh support using show ip ssh
2. configure ip domain using ip domain-name <domain-name> in global config
3. generate rsa key pairs using crypto key generate rsa in global config
4. configue user authentication by doing username <username> and enable secret <pass>
5. configure vty lines using transport input ssh and login local commands
6. enable ssh version 2 using ip ssh version 2 command in global config</pass></username></domain-name>

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17
Q

What show commands can be used to verify SSH is operational

A

show ip ssh

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18
Q

How do you change the command prompt

A

hostname <name></name>

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19
Q

How do you secure privilege exec

A

enable secret <pass></pass>

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20
Q

How do you secure console access

A

line con 0
password <pass>
login
exit</pass>

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21
Q

How do you secure remote access

A

line vty 0 4
password <pass>
login
exit</pass>

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22
Q

How do you encrypt all passwords

A

service password-encryption

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23
Q

How do you configure a loopback interface

A

interface loopback <number>
ip address <ip> <mask></mask></ip></number>

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24
Q

How do you configure a Layer 3 interface

A

To be available, an interface must be configured with at least one IP, activated, and optionally, a description.
ip address <ip> <mask>
ipv6 address <ipv6/prefix>
description <description>
no shutdown
exit</description></mask></ip>

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25
Q

Explain dual stacked

A

Network topology that uses both ipv4 and ipv6 at the same time.

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26
Q

For what do we use a loopback interface on a router

A

Usefu for testing since it ensures at least one interface will always be available.

27
Q

What does sh ip int br display, and what layer of OSI model is used?

A
28
Q

What does sh ip route display, and what layer of OSI model is used?

A

Displays a summary of all interfaces including the ipv4 or ipv6 address of the interface and current operational status. Uses Layer 2 on OSI model.

29
Q

What does sh run display

A

Displayscurrent running configuration allowing you to verify the switch has been correctly configured.

30
Q

What does the up arrow do?

A

recalls commands in history buffer

31
Q

Explain how an administrator can filter a show commands output

A

Using the pipe character with four filtering parameters including section, include, exclude, and begin.

32
Q

What does the command no ip domain lookup do

A

prevents router from trying to translate invalid commands into IP addresses.

33
Q

What is line con 0 used for

A

configuring console port parameters.

34
Q

What does logging synchronous do

A

synchronizes unsolicited device messages. Useful for when you are receiving console messages while entering commands.

35
Q

Explain how the switch MAC address table is built

A

Records the source MAC address into the table along with the port it was received.

36
Q

How does the switch operate once it receives a frame two steps

A

Using learn and forward method.
1. Examines source address. If source mac is not in the table, it adds it. If it is, resets that time out setting back to 5 minutes.
2. Examines destination mac address. If it is in the table, the frame is forwarded out the specified port. If not, the frame is flooded out all interfaces except the one it was received.

37
Q

Define Store and Forward

A

Receives the entire frame and ensures the frame is valid. Preferred switching method. has two characteristics, error checking and buffering.

38
Q

Define Cut Through

A

Forwards the frame immediately after determining destination MAC address and egress port.

39
Q

Define FCS

A

Frame check sequence. error-detecting code added to the end of a data frame.

40
Q

Define Error checking

A

The switch will check the FCS for CRC errors, discarding bad frames.

41
Q

What is fragment free switching

A

Stores the first 64 bytes of a frame before forwarding it. Compromise between cut through and store and forward

42
Q

What is a collision When does it occur

A

when two or more data packets try to occupy a network channel at the same time, causing interference and data loss.

43
Q

What is a broadcast domain

A

Consists of all devices on the LAN that receives the broadcast traffic

44
Q

Which devices forward broadcasts

A

Switches

45
Q

Which devices contain broadcasts

A

Switches

46
Q

What is a VLAN

A

Virtual Local Area Network, logically connected devices.

47
Q

Name and explain the benefits of VLANs

A

Smaller broadcast domains. Dividing th elan reduces the number of broadcast domains.
Improved security. Only users in the same vlan can communicate
improved it efficiency, vlans can group devices with similar requirements
reduced cost, one switch can support multiple groups or vlans
better performance, small broadcast domains reduce traffic
simpler management, similar groups will need similar applications.

48
Q

Name and explain the five types of VLANs

A

default vlan, it is vlan 1 and all vlans are assigned to it
Data vlan, dedicated to user-generated traffic
native vlan, used for trunk lids only
management vlan, for ssh/telnet traffic
voice vlan, QoS priority vlan and entire network must be designed to support voice

49
Q

How does 802 1q work for trunking and what does it do specifically?

A

tagging done on all vlans, modifies the original ethernet frame inserting a 4 byte tag to identify the vlan a frame velongs to

50
Q

Which show commands can verify a ports VLAN

A

1

51
Q

What is displayed by sh vlan brief

A

1

52
Q

Give the command syntax to create a VLAN including the switch prompt

A

1

53
Q

Give the command syntax to assign a VLAN to a switchport including the prompt

A

1

54
Q

Which show command displays a switchports VLAN membership

A

1

55
Q

How do you delete an existing VLAN file from a switch It takes two steps give switch prompt

A

11

56
Q

Give the syntax to create a trunk link including the prompt

A

1

57
Q

Give the show commands to verify the operation of a trunk link

A

1

58
Q

What is displayed in the show command output for trunk links

A

1

59
Q

Explain DTP

A

1

60
Q

Give the commands that disable DTP

A

1

61
Q

Name and explain the DTP modes

A

1

62
Q

Which modes form trunk links

A

1

63
Q

Which show command will display which DTP mode is in use

A

1

Routing (7 decks)

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