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Routing > Module 1 > Flashcards

Module 1 Flashcards

1
Q

What command is useful for detecting common media issues in switch interfaces?

A

show interfaces

Displays line and data link protocol status.

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2
Q

What does ‘FastEthernet0/18 is up’ indicate?

A

The hardware layer is operational, receiving a carrier detect signal.

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3
Q

What does ‘line protocol is up’ signify?

A

The data link layer protocol keepalives are being received.

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4
Q

If the interface is up but the line protocol is down, what could be the potential issues?

A
  • Encapsulation type mismatch
  • Interface on the other end is error-disabled
  • Hardware problem
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5
Q

What does it mean if both the line protocol and the interface are down?

A

A cable is not attached or another interface problem exists.

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6
Q

What does an administratively down interface indicate?

A

It has been manually disabled using the shutdown command.

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7
Q

Which command verifies that the switch has been correctly configured?

A

show running-config

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8
Q

What command displays the interface status and configuration?

A

show interfaces [interface-id]

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9
Q

What does auto-MDIX do?

A

Automatically detects required cable connection type and configures it.

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10
Q

What types of cables are used when auto-MDIX is not available?

A
  • Straight-through cables for servers, workstations, or routers
  • Crossover cables for switches or repeaters
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11
Q

What command enables auto-MDIX on a newer Cisco switch?

A

mdix auto

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12
Q

What must be set for the auto-MDIX feature to operate correctly?

A

Interface speed and duplex must be set to auto.

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13
Q

What command is used to examine the auto-MDIX setting for a specific interface?

A

show controllers ethernet-controller [phy] with include Auto-MDIX

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14
Q

What is the default setting for duplex and speed on Cisco Catalyst 2960 and 3560 switches?

A

auto

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15
Q

What is the maximum mode for 10/100/1000 ports when set to 1000 Mbps?

A

Only full-duplex mode.

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16
Q

What should be done when troubleshooting switch port issues?

A

Check duplex and speed settings.

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17
Q

What is the consequence of mismatched duplex settings?

A

Connectivity issues may arise.

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18
Q

What is full-duplex communication?

A

Allows both ends to transmit and receive data simultaneously.

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19
Q

What does a microsegmented LAN require?

A

A switch port with only one device connected and operating in full-duplex mode.

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20
Q

What is the effect of half-duplex communication?

A

Creates performance issues due to unidirectional data flow.

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21
Q

What command shows the summary of all interfaces and their status?

A

show ip interface brief

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22
Q

What command is used to verify that SSH is operational?

A

show ip ssh

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23
Q

What does the boot system command do?

A

Reboots all modules in switch and allows user to specify what image to use.

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24
Q

What are the steps in the boot sequence of a Cisco switch?

A
  • Load POST program
  • Load boot loader software
  • Initialize CPU
  • Initialize flash file system
  • Load IOS
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25
Q

What is the purpose of the VLAN interface configuration?

A

To create a virtual network segment within a physical network.

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26
Q

What does the System LED (SYST) indicate?

A

Whether the system is receiving power and functioning properly.

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27
Q

What does a green Port Speed LED (SPEED) indicate?

A

Port speed mode is selected.

28
Q

What does a green LED indicate on a switch?

A

Port speed mode is selected

The light associated with each port shows the port speed.

29
Q

What does a blinking amber LED indicate on a switch?

A

Port blocked preventing loop

This indicates a network issue that prevents data transmission.

30
Q

What is the purpose of the Mode button on a switch?

A

To move between different modes – STAT, DUPLX, SPEED, and PoE

Each mode provides different operational information.

31
Q

What is indicated by the amber LED under the PoE status?

A

PoE off due to fault

This indicates that there is an issue with the Power over Ethernet functionality.

32
Q

What command provides access to the boot loader on a switch?

A

Press and hold the Mode button while reconnecting power

This allows access to recover from system crashes.

33
Q

What is the first step in recovering from a system crash on a switch?

A

Connect a PC by console cable to the switch console port

Terminal emulation software must be configured to connect.

34
Q

What command is used to configure the default gateway on a switch?

A

ip default-gateway 172.17.99.1

This command sets the gateway for remote management access.

35
Q

What is the purpose of the switch virtual interface (SVI)?

A

To manage the switch from a remote network

The SVI allows for IP address assignment separate from physical ports.

36
Q

What must be configured for the management VLAN to be secure?

A

Use a VLAN other than VLAN 1 for management

VLAN 1 is the default and is considered less secure.

37
Q

What command displays the command history in a switch?

A

show history

Displays previously executed commands for easy recall.

38
Q

True or False: SSH uses TCP port 23.

A

False

SSH uses TCP port 22 for secure connections.

39
Q

What command verifies that the switch supports SSH?

A

show ip ssh

This command checks for SSH capability on the switch.

40
Q

Fill in the blank: To enable SSH, the switch must be configured with a unique _______.

A

[hostname]

A unique hostname is necessary for SSH configuration.

41
Q

What does the command ‘crypto key generate rsa’ do?

A

Enables SSH and generates an RSA key pair

This is a crucial step in setting up SSH on the switch.

42
Q

What type of errors does ‘Input Errors’ include?

A
  • Runts
  • Giants
  • CRC errors
  • No buffer
  • Frame
  • Overrun
  • Ignored counts

These errors indicate issues with incoming packets.

43
Q

What is a ‘runt’ frame?

A

An Ethernet frame smaller than 64 bytes

Typically caused by malfunctioning NICs or collisions.

44
Q

What indicates a ‘giant’ frame?

A

An Ethernet frame larger than 1518 bytes

Giants are discarded due to exceeding the maximum size.

45
Q

What command displays interface information and packet flow count?

A

show interfaces

This command provides statistics for all interfaces on the device.

46
Q

What is the administrative distance of a local host route?

A

0

Local host routes are prioritized due to their administrative distance.

47
Q

What command displays the IPv4 and IPv6 related information for all interfaces on a router?

A

show ip interface and show ipv6 interface

48
Q

What command reveals the three directly connected network entries and the three local host route interface entries?

A

show ip route and show ipv6 route

49
Q

What is the administrative distance of the local host route?

A

0

50
Q

What masks are associated with the local host route for IPv4 and IPv6?

A

/32 for IPv4 and /128 for IPv6

51
Q

What does a ‘C’ next to a route in the routing table indicate?

A

It indicates a directly connected network

52
Q

What determines if an IPv6 prefix is added to the IPv6 routing table as a connected route?

A

The router interface must be configured with a global unicast address and be in the ‘up/up’ state

53
Q

What command allows you to specify the number of lines to be displayed in the output?

A

terminal length

54
Q

What does the pipe (|) character do when used with show commands?

A

It enables filtering of the command output

55
Q

List the four filtering parameters that can be configured after the pipe.

A
  • section
  • include
  • exclude
  • begin
56
Q

What type of address is automatically added to an interface whenever a global unicast address is assigned?

A

Link-local address

57
Q

What command displays the interface status and all IPv6 addresses belonging to the interface?

A

show ipv6 interface gigabitethernet 0/0/0

58
Q

What commands can be used to quickly reveal the status of all interfaces on a router?

A

show ip interface brief and show ipv6 interface brief

59
Q

What indicates a problem with the router configuration or cabling?

A

A status of ‘down’ or protocol of ‘down’

60
Q

What command displays the commands applied to a specified interface?

A

show running-config interface interface-id

61
Q

What is required for an interface to be available on a router?

A
  • Configured with at least one IP address
  • Activated using the no shutdown command
  • Connected to another device
62
Q

What is a loopback interface?

A

A logical interface internal to the router, not assigned to a physical port

63
Q

What state is the loopback interface automatically placed in as long as the router is functioning?

A

up

64
Q

What is a common use for loopback interfaces?

A

Testing and managing a Cisco IOS device

65
Q

How do you enable and assign a loopback address?

A

Router(config)# interface loopback number
Router(config-if)# ip address ip-address subnet-mask

66
Q

What command shows counters and statistics for a specific interface?

A

show interfaces

Routing (19 decks)

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