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Routing > Module 7 > Flashcards

Module 7 Flashcards

1
Q

What command displays the TCP/IP parameters on a PC?

A

ipconfig /all

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2
Q

What is the purpose of the command ‘show ip dhcp server statistics’?

A

Displays count information regarding the number of DHCPv4 messages that have been sent and received

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3
Q

How can you verify DHCPv4 bindings?

A

Using the command ‘show ip dhcp binding’

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4
Q

What command shows the DHCPv4 commands configured on a router?

A

show running-config | section dhcp

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5
Q

True or False: The DHCPv4 service is enabled by default on Cisco routers.

A

True

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6
Q

What command is used to disable the DHCPv4 service?

A

no service dhcp

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7
Q

What is the function of the ‘ip helper-address’ command?

A

Configures the router to relay DHCPv4 messages to the DHCPv4 server

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8
Q

List the eight UDP services that the ‘ip helper-address’ command forwards by default.

A
  • Port 37: Time
  • Port 49: TACACS
  • Port 53: DNS
  • Port 67: DHCP/BOOTP server
  • Port 68: DHCP/BOOTP client
  • Port 69: TFTP
  • Port 137: NetBIOS name service
  • Port 138: NetBIOS datagram service
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9
Q

What command is used to configure an Ethernet interface as a DHCP client?

A

ip address dhcp

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10
Q

What do home routers typically do regarding IPv4 addressing?

A

Receive IPv4 addressing information automatically from the ISP

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11
Q

What command is used to exclude IPv4 addresses from being assigned by the DHCP server?

A

ip dhcp excluded-address low-address [high-address]

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12
Q

What is the first step in configuring a Cisco IOS DHCPv4 server?

A

Exclude IPv4 addresses

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13
Q

What command defines a DHCPv4 pool name?

A

ip dhcp pool pool-name

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14
Q

Fill in the blank: The DHCPv4 lease process starts with the client sending a _______ message.

A

DHCPDISCOVER

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15
Q

What is the last step in the DHCPv4 lease process?

A

DHCPACK

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16
Q

What happens when a DHCPv4 lease expires?

A

The DHCP server returns the address to the pool for reallocation

17
Q

How often must clients contact the DHCP server to extend their lease?

A

Periodically

18
Q

What command can be used to verify the configuration of the DHCP relay agent?

A

show ip interface

19
Q

What does the command ‘lease {days [hours [minutes]] | infinite}’ do?

A

Defines the duration of the DHCP lease

20
Q

What is the purpose of the ‘default-router’ command in DHCP configuration?

A

Defines the default gateway router

21
Q

True or False: A dedicated DHCPv4 server is necessary for all network configurations.

A

False

22
Q

What is the benefit of using DHCPv4 in network administration?

A

Saves time by dynamically assigning IP addresses and managing configurations

23
Q

What does the command ‘dns-server address [address2 … address8]’ do?

A

Defines the DNS server for DHCP clients

24
Q

What is the typical lease duration for DHCPv4 addresses?

A

Anywhere from 24 hours to a week or more

Lease duration can be configured by administrators.

25
Q

What are the four steps a client follows to obtain a DHCPv4 lease?

A
  • DHCP Discover (DHCPDISCOVER)
  • DHCP Offer (DHCPOFFER)
  • DHCP Request (DHCPREQUEST)
  • DHCP Acknowledgment (DHCPACK)

This process is initiated when the client boots or wants to join a network.

26
Q

What is the first step in the DHCPv4 lease renewal process?

A

DHCP Request (DHCPREQUEST)

The client sends this message to the original DHCPv4 server before the lease expires.

27
Q

What happens if a DHCPACK is not received after sending a DHCPREQUEST during lease renewal?

A

The client broadcasts another DHCPREQUEST

This allows other DHCPv4 servers to extend the lease.

28
Q

What is the second step in the lease renewal process after sending a DHCPREQUEST?

A

DHCP Acknowledgment (DHCPACK)

This message is sent by the server to verify the lease information.

29
Q

True or False: DHCP messages can only be sent as unicast.

A

False

DHCP messages can be sent as unicast or broadcast according to IETF RFC 2131.

30
Q

Fill in the blank: Clients lease the information from the server for an administratively defined _______.

A

[period]

This period is set by network administrators.

Routing (19 decks)

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