10.8.1 Packet Tracer - Configure CDP, LLDP, and NTP (Answers)

Last Updated: Nov 10, 2026 CCNA v7 Course #3 14 Comments

10.8.1 Packet Tracer - Configure CDP, LLDP, and NTP Answers

Topology

10.8.1 Packet Tracer - Configure CDP, LLDP, and NTP topology

10.8.1 Packet Tracer - Configure CDP, LLDP, and NTP

Addressing Table

Device Interface IP Address
HQ G0/0/0 192.168.1.1/24
G0/0/1 192.168.2.1/24
S0/1/0 192.168.3.1/30
Branch G0/0/0 192.168.4.1/24
S0/1/0 192.168.3.2/30
HQ-SW-1 VLAN 1 Not configured
HQ-SW-2 VLAN 1 Not configured
BR-SW-1 VLAN 10 192.168.4.250
BR-SW-2 VLAN 10 192.168.4.253
BR-SW-3 VLAN 10 192.168.4.254
NTP Server NIC 192.168.1.254
PC1 NIC 192.168.2.10
PC2 NIC 192.168.4.10
PC3 NIC 192.168.4.20

Objectives

In this activity, you will configure a router to receive time information over NTP and configure devices with CDP and LLDP.

  • Configure CDP to run globally on a device.
  • Disable CDP on device interfaces where necessary.
  • Configure LLDP to run globally on a device.
  • Configure LLDP to send and receive messages according to requirements.
  • Configure a router to use an NTP server.

Background / Scenario

A network administrator has been asked to investigate a new client’s network. Documentation is incomplete for the network, so some information needs to be discovered. In addition, the NTP server needs to be configured on a router. Discovery protocols must also be adjusted to control traffic discovery protocol traffic and prevent information about the network from being received by potentially unauthorized hosts.

Some of the device IP addresses are unknown to you. You must determine what the IP addresses are so that you can connect to the devices over SSH in order to configure them. You can enter them into the Addressing Table as you discover them.

Instructions

Use the table below to logon to the Branch switches when you need to do so.

Device Username User Password Enable Secret
BR-SW-1 admin SW1admin# SW1EnaAccess#
BR-SW-2 admin SW2admin# SW2EnaAccess#
BR-SW-3 admin SW3admin# SW3EnaAccess#

Note: Click the Fast Forward Time button in the blue bar below the topology to speed up STP convergence. You can also click it several times to speed up the CDP update process.

Configure LLDP as follows:

  • Disable CDP on the HQ router. 
    HQ(config)# no cdp run
  • Enable LLDP globally on HQ. 
    HQ(config)# lldp run
  • On HQ, configure the links to the switches to only receive LLDP messages. 
    HQ(config)# interface gigabitethernet 0/0/0
HQ(config-if)# no lldp transmit
HQ(config-if)# lldp receive
HQ(config-if)# interface gigabitethernet 0/0/1
HQ(config-if)# no lldp transmit
HQ(config-if)# lldp receive
    HQ# show lldp neighbors
Capability codes:
    (R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device
    (W) WLAN Access Point, (P) Repeater, (S) Station, (O) Other
Device ID           Local Intf     Hold-time  Capability      Port ID
HQ-SW-2             Gig0/0/1       120        B               Gig0/1
HQ-SW-1             Gig0/0/0       120        B               Gig0/1

Total entries displayed: 2
  • Disable CDP on the HQ-SW-1 and HQ-SW-2 switches.
    HQ-SW-1:

    HQ-SW-1(config)# no cdp run

    HQ-SW-2:

    HQ-SW-2(config)# no cdp run
  • Enable LLDP on the HQ-SW-1 and HQ-SW-2 switches.
    HQ-SW-1:

    HQ-SW-1(config)# lldp run

    HQ-SW-2:

    HQ-SW-2(config)# lldp run
  • On the HQ-SW-1 and HQ-SW-2 switches, configure the links to the HQ router to only send, not receive, LLDP messages.
    HQ-SW-1:

    HQ-SW-1(config)# interface gigabitethernet 0/1
HQ-SW-1(config-if)# no lldp receive

    HQ-SW-2:

    HQ-SW-2(config)# interface gigabitethernet 0/1
HQ-SW-2(config-if)# no lldp receive
  • Disable LLDP completely on the HQ-SW-1 and HQ-SW-2 access ports that are in use.
    HQ-SW-1:

    HQ-SW-1# show interfaces status
Port      Name               Status       Vlan       Duplex  Speed Type
<output omitted>
Fa0/24                       connected    1          a-full  a-100 10/100BaseTX
Gig0/1                       connected    1          a-full  a-100 10/100/1000BaseTX
<output omitted>
    HQ-SW-1(config)# interface fastethernet 0/24
HQ-SW-1(config-if)# no lldp receive
HQ-SW-1(config-if)# no lldp transmit

    HQ-SW-2:

    HQ-SW-2# show interfaces status
Port      Name               Status       Vlan       Duplex  Speed Type
Fa0/1                        connected    1          a-full  a-100 10/100BaseTX
<output omitted>
Gig0/1                       connected    1          a-full  a-100 10/100/1000BaseTX
<output omitted>
    HQ-SW-2(config)# interface fastethernet 0/1
HQ-SW-2(config-if)# no lldp receive
HQ-SW-2(config-if)# no lldp transmit

Configure CDP as follows:

  • Activate CDP on the Branch router. 
    Branch(config)# cdp run

    On the Branch router, issue the command show cdp neighbors detail to identify the IP address of BR-SW-1 and populate this address in the address table.

    Branch# show cdp neighbors detail

Device ID: BR-SW-1
Entry address(es):
  IP address : 192.168.4.250
Platform: cisco 2960, Capabilities: Switch
Interface: GigabitEthernet0/0/0.10, Port ID (outgoing port): GigabitEthernet0/1
Holdtime: 135

Version :
Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version 12.2(25)FX, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Wed 12-Oct-05 22:05 by pt_team

advertisement version: 2
Duplex: full
  • Connect to switch BR-SW-1 over SSH. You will not be able to open a CLI window by clicking the Branch switches. 
    Branch# ssh -l admin 192.168.4.250

Password: SW1admin#

BR-SW-1>

    On the BR-SW-1, issue the command show cdp neighbors detail to identify the IP address of BR-SW-2/BR-SW-3 and populate this address in the address table.

    BR-SW-1> enable
Password: SW1EnaAccess#

BR-SW-1# show cdp neighbors detail

Device ID: BR-SW-3
Entry address(es):
  IP address : 192.168.4.254
Platform: cisco 2960, Capabilities: Switch
Interface: FastEthernet0/24, Port ID (outgoing port): GigabitEthernet0/1
Holdtime: 140

Version :
Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version 12.2(25)FX, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Wed 12-Oct-05 22:05 by pt_team

advertisement version: 2
Duplex: full
---------------------------

Device ID: BR-SW-2
Entry address(es):
  IP address : 192.168.4.253
Platform: cisco 2960, Capabilities: Switch
Interface: GigabitEthernet0/2, Port ID (outgoing port): GigabitEthernet0/2
Holdtime: 140

Version :
Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version 12.2(25)FX, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Wed 12-Oct-05 22:05 by pt_team

advertisement version: 2
Duplex: full
---------------------------

Device ID: Branch
Entry address(es):
Platform: cisco ISR4300, Capabilities: Router
Interface: GigabitEthernet0/1, Port ID (outgoing port): GigabitEthernet0/0/0
Holdtime: 161

Version :
Cisco IOS XE Software, Version 03.13.04.S - Extended Support Release
Cisco IOS Software, ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 15.5(3)S5, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2017 by Cisco Systems, Inc.
Compiled Mon 05-Oct-15 11:24 by mcpre

advertisement version: 2
Duplex: full
---------------------------

Device ID: Branch
Entry address(es):
  IP address : 192.168.4.1
Platform: cisco ISR4300, Capabilities: Router
Interface: GigabitEthernet0/1, Port ID (outgoing port): GigabitEthernet0/0/0.10
Holdtime: 161

Version :
Cisco IOS XE Software, Version 03.13.04.S - Extended Support Release
Cisco IOS Software, ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 15.5(3)S5, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2017 by Cisco Systems, Inc.
Compiled Mon 05-Oct-15 11:24 by mcpre

advertisement version: 2
Duplex: full
  • Connect to switches BR-SW-2 and BR-SW-3 over SSH. Configure the access ports that are in use to not send CDP messages out of the ports.
    BR-SW-2:

    BR-SW-1# ssh -l admin 192.168.4.253

Password: SW2admin#

BR-SW-2> enable
Password: SW2EnaAccess#
BR-SW-2#
    BR-SW-2# show interfaces status
Port      Name               Status       Vlan       Duplex  Speed Type
Fa0/1                        connected    10         a-full  a-100 10/100BaseTX
<output omitted>
Fa0/24                       connected    trunk      a-full  a-100 10/100BaseTX
<output omitted>
Gig0/2                       connected    trunk      a-full  a-100 10/100/1000BaseTX
    BR-SW-2(config)# interface fastethernet 0/1
BR-SW-2(config-if)# no cdp enable
    BR-SW-2# show cdp interface fastethernet 0/1
BR-SW-2#

    BR-SW-3:

    BR-SW-2# ssh -l admin 192.168.4.254

Password: SW3admin#

BR-SW-3> enable
Password: SW3EnaAccess#
BR-SW-3#
    BR-SW-3# show interfaces status
Port      Name               Status       Vlan       Duplex  Speed Type
Fa0/1                        connected    1          a-full  a-100 10/100BaseTX
<output omitted>
Fa0/24                       connected    trunk      a-full  a-100 10/100BaseTX
Gig0/1                       connected    trunk      a-full  a-100 10/100/1000BaseTX
<output omitted>
    BR-SW-3(config)# interface fastethernet 0/1
BR-SW-3(config-if)# no cdp enable
    BR-SW-3# show cdp interface fastethernet 0/1
BR-SW-3#

Configure NTP:

  • Configure HQ to use the device at 192.168.1.254 as an NTP server. 
    HQ(config)# ntp server 192.168.1.254
    HQ# show ntp status
Clock is synchronized, stratum 2, reference is 192.168.1.254
nominal freq is 250.0000 Hz, actual freq is 249.9990 Hz, precision is 2**24
reference time is E0E0EA8A.0000004B (2:8:10.075 UTC Fri Aug 23 2019)
clock offset is 0.00 msec, root delay is 0.00  msec
root dispersion is 68.94 msec, peer dispersion is -137269716642244.14 msec.
loopfilter state is 'CTRL' (Normal Controlled Loop), drift is - 0.000001193 s/s system poll interval is 4, last update was 12 sec ago.

HQ# show ntp associations

address         ref clock       st   when     poll    reach  delay          offset            disp
*~192.168.1.254 127.127.1.1     1    1        16      377    0.00           0.00              -137269716642243.92
 * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured

Device Configs - Final

ROUTER HQ

! ==============================================================
!--- 10.8.1 Packet Tracer - Configure CDP, LLDP, and NTP
!--- ANSWER SCRIPT FOR ROUTER HQ
!--- Usage: open the HQ CLI tab and paste this whole file at the HQ> prompt. Every line beginning with "!" is a comment; IOS ignores it, so pasting a comment by accident is harmless.
! ==============================================================

enable
configure terminal

! --------------------------------------------------------------
!--- Configure LLDP
! --------------------------------------------------------------

!--- Disable CDP on HQ.
no cdp run

!--- Enable LLDP globally.
lldp run

!--- Links to HQ-SW-1 and HQ-SW-2: receive LLDP only.
interface gigabitethernet 0/0/0
 no lldp transmit
 lldp receive
 exit
interface gigabitethernet 0/0/1
 no lldp transmit
 lldp receive
 exit

! --------------------------------------------------------------
!--- Configure NTP
! --------------------------------------------------------------

!--- Use 192.168.1.254 as the NTP server.
ntp server 192.168.1.254

end

! --------------------------------------------------------------
!--- Save the configuration to NVRAM. (Press Enter when prompted for the destination filename.)
! --------------------------------------------------------------
copy running-config startup-config


! ==============================================================
!--- Verification:
!---   show cdp               -> % CDP is not enabled
!---   show lldp neighbors    -> HQ-SW-1 and HQ-SW-2
!---   show ntp status        -> Clock is synchronized, reference is 192.168.1.254
! ==============================================================

ROUTER Branch

! ==============================================================
!--- 10.8.1 Packet Tracer - Configure CDP, LLDP, and NTP
!--- ANSWER SCRIPT FOR ROUTER Branch
!--- Usage: open the Branch CLI tab and paste this whole file at the Branch> prompt. Every line beginning with "!" is a comment; IOS ignores it, so pasting a comment by accident is harmless.
! ==============================================================

enable
configure terminal

! --------------------------------------------------------------
!--- Configure CDP
! --------------------------------------------------------------

!--- Activate CDP on Branch.
cdp run

end

! --------------------------------------------------------------
!--- Save the configuration to NVRAM. (Press Enter when prompted for the destination filename.)
! --------------------------------------------------------------
copy running-config startup-config


! ==============================================================
!--- Verification:
!---   show cdp neighbors detail -> BR-SW-1, IP address 192.168.4.250
! ==============================================================

SWITCH HQ-SW-1

! ==============================================================
!--- 10.8.1 Packet Tracer - Configure CDP, LLDP, and NTP
!--- ANSWER SCRIPT FOR SWITCH HQ-SW-1
!--- Usage: open the HQ-SW-1 CLI tab and paste this whole file at the HQ-SW-1> prompt. Every line beginning with "!" is a comment; IOS ignores it, so pasting a comment by accident is harmless.
! ==============================================================

enable
configure terminal

! --------------------------------------------------------------
!--- Configure LLDP
! --------------------------------------------------------------

!--- Disable CDP.
no cdp run

!--- Enable LLDP globally.
lldp run

!--- Link to the HQ router: send LLDP only, do not receive.
interface gigabitethernet 0/1
 no lldp receive
 exit

!--- Access port in use (NTP Server): disable LLDP completely.
interface fastethernet 0/24
 no lldp receive
 no lldp transmit
 exit

end

! --------------------------------------------------------------
!--- Save the configuration to NVRAM. (Press Enter when prompted for the destination filename.)
! --------------------------------------------------------------
copy running-config startup-config


! ==============================================================
!--- Verification:
!---   show cdp               -> % CDP is not enabled
!---   show lldp interface     -> G0/1 Rx: disabled; Fa0/24 Tx and Rx: disabled
! ==============================================================

SWITCH HQ-SW-2

! ==============================================================
!--- 10.8.1 Packet Tracer - Configure CDP, LLDP, and NTP
!--- ANSWER SCRIPT FOR SWITCH HQ-SW-2
!--- Usage: open the HQ-SW-2 CLI tab and paste this whole file at the HQ-SW-2> prompt. Every line beginning with "!" is a comment; IOS ignores it, so pasting a comment by accident is harmless.
! ==============================================================

enable
configure terminal

! --------------------------------------------------------------
!--- Configure LLDP
! --------------------------------------------------------------

!--- Disable CDP.
no cdp run

!--- Enable LLDP globally.
lldp run

!--- Link to the HQ router: send LLDP only, do not receive.
interface gigabitethernet 0/1
 no lldp receive
 exit

!--- Access port in use (PC1): disable LLDP completely.
interface fastethernet 0/1
 no lldp receive
 no lldp transmit
 exit

end

! --------------------------------------------------------------
!--- Save the configuration to NVRAM. (Press Enter when prompted for the destination filename.)
! --------------------------------------------------------------
copy running-config startup-config


! ==============================================================
!--- Verification:
!---   show cdp               -> % CDP is not enabled
!---   show lldp interface     -> G0/1 Rx: disabled; Fa0/1 Tx and Rx: disabled
! ==============================================================

SWITCH BR-SW-2

! ==============================================================
!--- 10.8.1 Packet Tracer - Configure CDP, LLDP, and NTP
!--- ANSWER SCRIPT FOR SWITCH BR-SW-2
!--- Usage: BR-SW-2 has no CLI tab. From BR-SW-1, run  ssh -l admin 192.168.4.253  (password SW2admin#), then paste this whole file at the BR-SW-2> prompt; enter the enable secret SW2EnaAccess# when asked. Every line beginning with "!" is a comment; IOS ignores it.
! ==============================================================

enable
configure terminal

! --------------------------------------------------------------
!--- Configure CDP
! --------------------------------------------------------------

!--- Access port in use (PC2): do not send CDP messages.
interface fastethernet 0/1
 no cdp enable
 exit

end

! --------------------------------------------------------------
!--- Save the configuration to NVRAM. (Press Enter when prompted for the destination filename.)
! --------------------------------------------------------------
copy running-config startup-config


! ==============================================================
!--- Verification:
!---   show cdp interface fastethernet 0/1   -> no output (CDP disabled on the port)
! ==============================================================

SWITCH BR-SW-3

! ==============================================================
!--- 10.8.1 Packet Tracer - Configure CDP, LLDP, and NTP
!--- ANSWER SCRIPT FOR SWITCH BR-SW-3
!--- Usage: BR-SW-3 has no CLI tab. From BR-SW-2, run  ssh -l admin 192.168.4.254  (password SW3admin#), then paste this whole file at the BR-SW-3> prompt; enter the enable secret SW3EnaAccess# when asked. Every line beginning with "!" is a comment; IOS ignores it.
! ==============================================================

enable
configure terminal

! --------------------------------------------------------------
!--- Configure CDP
! --------------------------------------------------------------

!--- Access port in use (PC3): do not send CDP messages.
interface fastethernet 0/1
 no cdp enable
 exit

end

! --------------------------------------------------------------
!--- Save the configuration to NVRAM. (Press Enter when prompted for the destination filename.)
! --------------------------------------------------------------
copy running-config startup-config


! ==============================================================
!--- Verification:
!---   show cdp interface fastethernet 0/1   -> no output (CDP disabled on the port)
! ==============================================================

Download Packet Tracer (.pka) file:

Icon
10.8.1 Packet Tracer - Configure CDP, LLDP, and NTP.pka 550.05 KB 9907 downloads
...
Download

Previous Lab
10.7.6 Packet Tracer – Use a TFTP Server to Upgrade a Cisco IOS Image

Next Lab
11.5.1 Packet Tracer – Compare Layer 2 and Layer 3 Devices

Tags:, , ,

About The Author

ITExamAnswers Editorial Team

The ITExamAnswers Editorial Team is a dedicated group of certified IT professionals and network engineers. We rigorously review, verify, and update all exam materials to ensure you receive the most accurate and reliable resources for your certification journey.

Related Posts

Subscribe
Notify of
guest

14 Corrections & Clarifications