M1.10 Basic Router Configuration

Question 1

What is the first recommended configuration task on a new router?

Answer 1

Configure the device name.

Question 2

Which command is used to set a router’s hostname to R1?

Answer 2

hostname R1

Question 3

In which configuration mode do you set the router’s hostname?

Answer 3

Global configuration mode.

Question 4

What is the primary purpose of securing privileged EXEC mode?

Answer 4

It provides complete access to the device so it is the most important mode to secure.

Question 5

Which command secures privileged EXEC mode with an encrypted password?

Answer 5

enable secret [password]

Question 6

Which command secures the user EXEC mode via the console line?

Answer 6

line console 0 followed by password [password] and login.

Question 7

Why is it important to secure user EXEC mode?

Answer 7

To control initial access to the device’s command line interface.

Question 8

Which commands are used to configure access for remote Telnet or SSH?

Answer 8

line vty 0 15 followed by password [password] and login.

Question 9

What is the purpose of the ‘login’ command on VTY lines?

Answer 9

It prompts users for a password to gain remote access.

Question 10

What is the function of the service password-encryption command?

Answer 10

To encrypt all plaintext passwords in the configuration file.

Question 11

Does service password-encryption encrypt the enable secret password?

Answer 11

No the enable secret is already hashed using MD5 or stronger while service password-encryption uses a weak reversible algorithm.

Question 12

Which type of passwords does service password-encryption affect?

Answer 12

Plaintext passwords like the user EXEC and VTY line passwords.

Question 13

What is the purpose of providing a legal notification on a router?

Answer 13

To warn users that access is restricted to permitted personnel only.

Question 14

Which command is used to configure a legal notification banner?

Answer 14

banner motd #[message]#

Question 15

What is the consequence of a router losing power before the configuration is saved?

Answer 15

All configured commands would be lost.

Question 16

Where does the running configuration exist?

Answer 16

In RAM.

Question 17

Where is the startup configuration stored?

Answer 17

In NVRAM.

Question 18

What command saves the running-config to the startup-config?

Answer 18

copy running-config startup-config

Question 19

What is the primary risk of not saving your configuration?

Answer 19

Loss of all changes upon device reload or power loss.

Question 20

How can you tell the device name has been configured successfully?

Answer 20

The command prompt changes to display the new hostname.

Question 21

Why must router interfaces be configured before they can be used?

Answer 21

Routers are not reachable by end devices until their interfaces are configured.

Question 22

What are the two built-in interfaces on a Cisco ISR 4321 router?

Answer 22

GigabitEthernet 0/0/0 and GigabitEthernet 0/0/1.

Question 23

What command is used to enter the configuration mode for interface G0/0/0?

Answer 23

interface GigabitEthernet 0/0/0

Question 24

What is the command to assign IPv4 address 192.168.10.1 with a /24 subnet mask?

Answer 24

ip address 192.168.10.1 255.255.255.0

Question 25

What is the purpose of the description command on an interface?

Answer 25

To provide information about the network it connects to for troubleshooting.

Question 26

Is the description command required to activate an interface?

Answer 26

No it is not required but it is considered good practice.

Question 27

What is the character limit for an interface description?

Answer 27

240 characters.

Question 28

What is the function of the no shutdown command?

Answer 28

It administratively enables or powers on the interface.

Question 29

What must be true for an interface's physical layer to become active?

Answer 29

It must be enabled with no shutdown and connected to another device.

Question 30

What happens when a router interface is successfully enabled with no shutdown?

Answer 30

Information messages are displayed confirming the link is enabled.

Question 31

In what state is a router interface by default?

Answer 31

Administratively down or shutdown.

Question 32

On a direct inter-router connection what must be configured for the link to be active?

Answer 32

Both interconnecting interfaces must be configured and enabled.

Question 33

What is the primary task after completing the basic security settings on a router?

Answer 33

Configure its interfaces.

Question 34

Configuring a router interface is similar to configuring what on a switch?

Answer 34

A management Switch Virtual Interface or SVI.

Question 35

What are the three essential commands to make a router interface operational on an IPv4 network?

Answer 35

interface [name] then ip address [address] [mask] then no shutdown.

Question 36

Which command is most useful for a quick summary of all interfaces their IP addresses and status?

Answer 36

show ip interface brief

Question 37

What does a Status of 'up' and Protocol of 'up' indicate in show ip interface brief output?

Answer 37

The interface is configured correctly the cabling is good and the physical layer is active.

Question 38

What might a Status of 'administratively down' indicate?

Answer 38

The no shutdown command has not been issued on the interface.

Question 39

What does the show ip route command display?

Answer 39

The content of the IPv4 routing table stored in RAM.

Question 40

What does the show ipv6 route command display?

Answer 40

The content of the IPv6 routing table stored in RAM.

Question 41

Which command displays detailed Layer 2 statistics like MAC addresses errors and runts?

Answer 41

show interfaces

Question 42

To see detailed IPv4 statistics for all router interfaces which command should be used?

Answer 42

show ip interfaces

Question 43

To see detailed IPv6 statistics for all router interfaces which command should be used?

Answer 43

show ipv6 interfaces

Question 44

What is the IPv6 equivalent of the show ip interface brief command?

Answer 44

show ipv6 interface brief

Question 45

What does a Status of 'down' and Protocol of 'down' likely indicate?

Answer 45

A problem with the cabling or the connected device.

Question 46

What information does the show ip route command provide about directly connected networks?

Answer 46

It shows networks that are directly attached to the router's active interfaces.

Question 47

What is a key difference between show interfaces and show ip interfaces?

Answer 47

show interfaces displays Layer 2 details while show ip interfaces focuses on Layer 3 IPv4 statistics.

Question 48

Why would an administrator use show interfaces?

Answer 48

To check for errors runts giants or other Layer 2 issues on an interface.

Question 49

The routing table is stored in which type of memory?

Answer 49

RAM.

Question 50

If a configured interface shows 'down' 'down' what is the first thing to check?

Answer 50

The physical connection and the status of the device on the other end.

Question 51

If an interface status is 'up' but the protocol is 'down' what could be the problem?

Answer 51

A protocol mismatch or configuration error on one side of the link.

Question 52

What does the line protocol being down on an interface typically indicate?

Answer 52

A Layer 2 problem such as an encapsulation mismatch or keepalive failure.

Question 53

What does the output of show ip interface brief confirm?

Answer 53

It confirms that interfaces are enabled and have the correct IP addresses.

Question 54

Which two show commands are best for verifying Layer 3 connectivity and paths?

Answer 54

show ip route and show ipv6 route.

Question 55

A problem with either configuration or cabling would be indicated by what output in show ip interface brief?

Answer 55

Anything other than Status of up and Protocol of up.

Question 56

When does a host use its default gateway?

Answer 56

Only when it needs to send a packet to a device on another network.

Question 57

What is typically the default gateway address for a host?

Answer 57

The IP address of the router interface on the same local network as the host.

Question 58

If PC1 on network A sends a packet to PC2 on network A is the default gateway used?

Answer 58

No the packet is sent directly through the local switch.

Question 59

If PC1 on network A sends a packet to PC3 on network B where does PC1 forward the packet?

Answer 59

To its default gateway router.

Question 60

What must be true about the IP addresses of a host and its default gateway?

Answer 60

They must be in the same network.

Question 61

Why might a Layer 2 switch need an IP address and default gateway?

Answer 61

To allow an administrator to manage it remotely from a different network.

Question 62

What is a Switch Virtual Interface or SVI?

Answer 62

A virtual interface on a switch configured with an IP address for management.

Question 63

What command configures the IPv4 default gateway on a Cisco switch?

Answer 63

ip default-gateway [ip-address]

Question 64

In which configuration mode is the switch default gateway configured?

Answer 64

Global configuration mode.

Question 65

Why does a switch need a default gateway for remote management?

Answer 65

To send reply packets back to an administrator located on a different network.

Question 66

How does an IPv6-enabled switch learn its default gateway?

Answer 66

It automatically receives it from an ICMPv6 Router Advertisement message.

Question 67

Does an administrator need to manually configure the IPv6 default gateway on a switch?

Answer 67

No the switch learns it automatically from the router.

Question 68

What is the function of a router in relation to a default gateway?

Answer 68

The router accepts packets destined for other networks and forwards them.

Question 69

Do end devices connected to a switch need a default gateway configured?

Answer 69

Yes if they need to communicate beyond their local network.

Question 70

What is the primary role of the default gateway?

Answer 70

To provide a path for traffic to exit the local network.

Question 71

What does NIM stand for in the context of a Cisco 4000 series router?

Answer 71

Network Interface Module.

Question 72

What is the purpose of a NIM slot on a router?

Answer 72

To add expansion cards for different connection types like serial.

Question 73

What does SFP stand for?

Answer 73

Small Form-factor Pluggable.

Question 74

What is the function of an SFP port on a network device?

Answer 74

It allows a fiber optic transceiver to be plugged in.

Question 75

What does EHWIC stand for on a Cisco 2900 router?

Answer 75

Enhanced High-Speed WAN Interface Card.

Question 76

Which ports are integrated or built-in on a Cisco 4221 router?

Answer 76

Gig0/0/0 and Gig0/0/1.

Question 77

What is the current recommended switch series mentioned in the text?

Answer 77

The Cisco 2960+ series switches.

Question 78

What type of connection can be added using a NIM card?

Answer 78

Serial connections.

Question 79

What technology do SFPs enable on a router or switch?

Answer 79

Fiber optic connectivity.