CCNA Routing and Switching Essentials Skills Assessment – Student Training Exam Answers

CCNA: Routing and Switching Essentials Skills Assessment – Student Training Exam Answers

Topology

CCNA Routing and Switching Essentials Skills Assessment - Student Training Exam Answers 2

Assessment Objectives

  • Part 1: Initialize Devices (6 points, 5 minutes)
  • Part 2: Configure Device Basic Settings (33 points, 20 minutes)
  • Part 3: Configure Switch Security, VLANs, and Inter-VLAN Routing (18 points, 15 minutes)
  • Part 4: Configure RIPv2 Dynamic Routing Protocol (14 points, 15 minutes)
  • Part 5: Implement DHCP and NAT for IPv4 (15 points, 15 minutes)
  • Part 6: Configure NTP (5 points, 5 minutes)
  • Part 7: Configure and Verify Access Control Lists (ACLs) (9 points, 15 minutes)

Scenario

In this Skills Assessment (SA) you will configure a small network to support IPv4 and IPv6 connectivity, switch security, inter VLAN routing, RIPv2 dynamic routing protocol, Dynamic Host Configuration Protocol (DHCP), dynamic and static Network Address Translation (NAT), Access Control Lists (ACLs), and server/client Network Time Protocol (NTP). You will test and document the network using common CLI commands throughout the assessment.

Required Resources

  • 3 Routers (Cisco 1941 with Cisco IOS Release 15.4(3)M2 universal image or comparable)
  • 2 Switches (Cisco 2960 with Cisco IOS Release 15.0(2)SE7 lanbasek9 image or comparable)
  • 3 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term)
  • Console cable to configure the Cisco IOS devices via the console ports
  • Ethernet and Serial cables as shown in the topology

Part 1: Initialize Devices

Total points: 6

Time: 5 minutes

Step 1: Initialize and reload the routers and switches.

Erase the startup configurations and reload the devices.
Before proceeding, have your instructor verify device initializations.

Task IOS Command Points
Erase the startup-config file on all routers. R1# erasestartup-config

R2# erasestartup-config

R3# erase startup-config

1½ points (½ point per router)
Reload all routers. R1# reload

R2# reload

R3# reload

1 ½ points (½ point per router)
Erase the startup-config file on all switches and remove theold VLAN database. S1# erase startup-config

S1#delete vlan.dat

S3# erase startup-config

S3# delete vlan-dat

1 point (½ pointper switch)

Reload both switches. S1# reload

S3# reload

1 point (½ pointper switch)
Verify VLAN database is absent from flash on both switches. S1# show flash

S3# show flash

1 point (½ pointper switch)

Instructor Sign-off Part 1: _________________________
Points: __________ of 6

Part 2: Configure Device Basic Settings

Total points: 30

Time: 20 minutes

Step 1: Configure the Internet Server.

Configuration tasks for the Internet Server include the following (refer to the Topology for IP address information):

Configuration Item or Task Specification Points
IPv4 Address 209.165.200.238 (1/2 point)
IPv4 Subnet Mask 255.255.255.248 (1/2 point)
Default Gateway 209.165.200.233 N/A
IPv6 Address/Subnet 2001:DB8:ACAD:A::38/64 (1/2 point)
IPv6 Default Gateway 2001:DB8:ACAD:A::1 N/A

Note: It may be necessary to disable the PC firewall for pings to be successful later in this lab.

Step 2: Configure R1.

Configuration tasks for R1 include the following:

Configuration Item or Task Specification Points
Disable DNS lookup no ip domain-lookup (1/2 point)
Router name R1 hostname R1 (1/2 point)
Encrypted privileged exec password Class

enable secret class

(1/2 point)
Console access password Cisco

line con 0   

Password cisco

login

(1/2 point)
Telnet access password Cisco

line vty 0 15 
password cisco  

login

(1/2 point)
Encrypt the clear text passwords Service password-encryption (1/2 point)
MOTD banner Unauthorized Access is Prohibited!

Banner motd #Unauthorized access is Prohibited!#

(1/2 point)
Interface S0/0/0 Set the description

Set the Ipv4 address. Refer to Topology diagram for address information.

Set the Ipv6 address. Refer to Topology diagram for address information.

Set the clocking rate to 128000

Activate Interface

Int S0/0/0

Description connection to R2

Ip address 172.16.1.1 255.255.255.252

Ipv6 address 2001:db8:acad:1::1/64

Clock rate 128000

No shut

exit

(1 point)
Default routes Configure a default IPv4 route out S0/0/0

Configure a default IPv6 route out S0/0/0

Ip route 0.0.0.0.0.0.0.0 s0/0/0

Ipv6 route ::/0 s0/0/0

(1 point)

Note: Do not configure G0/1 at this time.

Step 3: Configure R2.

Configuration tasks for R2 include the following:

Configuration Item or Task Specification Points
Disable DNS lookup No ip domain-lookup (1/2 point)
Router name R2   hostname R2 (1/2 point)
Encrypted privileged exec password Class      enable secret class (1/2 point)
Console access password Cisco

line con 0

password cisco

login

(1/2 point)
Telnet access password Cisco

line vty 0 15  

password cisco  

login

(1/2 point)
Encrypt the clear text passwords Service password-encryption (1/2 point)
Enable HTTP server Ip http server (1/2 point)
MOTD banner Unauthorized Access is Prohibited!   Banner motd # unauthorized access is prohibited!# (1/2 point)
Interface S0/0/0 Set the description

Set the IPv4 address. Use the next available address in the subnet.

Set the IPv6 address. Refer to Topology diagram for address information.

Activate Interface

Int s0/0/0

Description connection to R1

Ip address 172.16.1.2 255.255.255.252

Ipv6 address 2001:db8:acad:1::2/64

No shut

(1 point)
Interface S0/0/1 Set the description

Set the IPv4 address. Use the second available address in the subnet.

Set the IPv6 address. Refer to Topology diagram for address information.

Set clocking rate to 128000

Activate Interface

Int s0/0/1

Description connection to R3

Ip address 172.16.2.2 255.255.255.252

Ipv5 address 2001:db8:acad:2::2/64

Clock rate 128000

No shut

(1 point)
Interface G0/0 (Simulated Internet) Set the Description

Set the IPv4 address. Use the first available address in the subnet.

Set the IPv6 address. Use the first available address in the subnet.

Activate Interface

Int g0/0

Description connection to Internet

Ip address 209.165.200.233  255.255.255.248

Ipv6 address 2001:db8:acad:a::1/64

No shut

(1 point)
Interface Loopback 0 (Simulated Web Server) Set the description.

Set the IPv4 address.

Int loopback 0

Ip address 10.10.10.10 255.255.255.255

Description Simulatedto Web Server

exit

(1/2 point)
Default route Configure a default IPv4 route out G0/0.

Configure a default IPv6 route out G0/0.

Ip route 0.0.0.0.0.0.0.0 g0/0

Ipv6 route ::/0 g0/0

(1 point)
Step 4: Configure R3.

Configuration tasks for R3 include the following:

Configuration Item or Task Specification Points
Disable DNS lookup No ip domain-lookup (1/2 point)
Router name R3           hostname R3 (1/2 point)
Encrypted privileged exec password Class    enable secret class (1/2 point)
Console access password Cisco

 line con 0  

password cisco   

login

(1/2 point)
Telnet access password Cisco

line vty 0 15 

password cisco    

login

(1/2 point)
Encrypt the clear text passwords Service password-encryption (1/2 point)
MOTD banner Unauthorized Access is Prohibited!   Banner motd#Unauthorized access is Prohibited!# (1/2 point)
Interface S0/0/1 Set the description

Set the IPv4 address. Use the first available address in the subnet.

Set the IPv6 address. Refer to Topology diagram for address information.

Activate Interface

Int s0/0/1

Description connection to R2

Ip address 172.16.2.1 255.255.255.252

Ipv6 address 2001:db8:acad:2::1/64

No shut

(1 point)
Interface Loopback 4 Set the IPv4 address. Use the first available address in the subnet.

Int loopback 4

Ip address 192.168.4.1 255.255.255.0

(1/2 point)
Interface Loopback 5 Set the IPv4 address. Use the first available address in the subnet.

Int loopback 5

Ip address 192.168.5.1 255.255.255.0

(1/2 point)
Interface Loopback 6 Set the IPv4 address. Use the first available address in the subnet.

Int loopback 6

Ip address 192.168.6.1 255.255.255.0

(1/2 point)
Interface Loopback 7 Set the IPv6 address. Refer to Topology diagram for address information.

Int loopback 7

Ipv6 address 2001:db8:acad:3::1/64

(1/2 point)
Default routes Configure a default IPv4 route out S0/0/1.

Configure a default IPv6 route out S0/0/1.

Ip route 0.0.0.0.0.0.0.0 s0/0/1

Ipv6 route ::/0 s0/0/1

(1 point)
Configure S1.

Configuration tasks for S1 include the following:

Configuration Item or Task Specification Points
Disable DNS lookup No ip domain-lookup (1/2 point)
Switch name S1        hostname S1 (1/2 point)
Encrypted privileged exec password Class     enable secret class (1/2 point)
Console access password Cisco    line con 0  password cisco   login (1/2 point)
Telnet access password Cisco    line vty 0 15   password cisco   login (1/2 point)
Encrypt the clear text passwords Service password-encryption (1/2 point)
MOTD banner Unauthorized Access is Prohibited!   Banner motd #Unauthorized access is Prohibited!# (1/2 point)
Step 6: Configure S3

Configuration tasks for S3 include the following:

Configuration Item or Task Specification Points
Disable DNS lookup No ip domain-lookup (1/2 point)
Switch name S3                 hostname S3 (1/2 point)
Encrypted privileged exec password Class              enable secret class (1/2 point)
Console access password Cisco          line con 0  password cisco   login (1/2 point)
Telnet access password Cisco          line vty 0 15   password cisco   login (1/2 point)
Encrypt the clear text passwords Service password-encryption (1/2 point)
MOTD banner Unauthorized Access is Prohibited!

Banner motd #Unauthorized access is Prohibited!#

(1/2 point)
Step 4: Verify network connectivity.

Use the ping command to test connectivity between network devices.

Use the following table to methodically verify connectivity with each network device. Take corrective action to establish connectivity if a test fails:

From To IP Address Ping Results Points
R1 R2, S0/0/0 172.16.1.2 Successful (1 point)
R2 R3, S0/0/1 172.16.2.1 successful (1 point)
Internet Server Default Gateway 209.165.200.233 Successful (1 point)

Note: It may be necessary to disable the PC firewall for pings to be successful.

Instructor Sign-off Part 2: ______________________

Points: _________ of 33

Part 3: Configure Switch Security, VLANS, and Inter VLAN Routing

Total points: 18

Time: 15 minutes

Step 1: Configure S1.

Configuration tasks for S1 include the following:

Configuration Item or Task Specification Points
Create the VLAN database Use Topology VLAN Key table to create and name each of the listed VLANS.

Vlan 21

Name Accounting

Vlan 23

Name Engineering

Vlan 99

Name Management

exit

(1 point)
Assign the management IP address. Assign the IPv4 address to the Management VLAN. Use the IP address assigned to S1 in the Topology diagram.

Vlan 99

Ip address 192.168.99.2 255.255.255.0

No shut

exit

(1/2 point)
Assign the default-gateway Assign the first IPv4 address in the subnet as the default-gateway.

Ip default-gateway 192.168.99.1

(1/2 point)
Force trunking on Interface F0/3 Use VLAN 1 as the native VLAN.

Int f0/3

Switchport mode trunk

Switchport trunk native vlan 1

(1 point)
Force trunking on Interface F0/5 Use VLAN 1 as the native VLAN.

Int f0/5

Switchport mode trunk

Switchport trunk native vlan 1

(1 point)
Configure all other ports as access ports Use the interface range command.

Int range f0/1-2, f0/4,f0/6-24,g0/1-2

Switchport mode access

(1/2 point)
Assign F0/6 to VLAN 21 Int f0/6

Switchport access vlan 21

(1/2 point)
Shutdown all unused ports Int range f0/1-2,f0/4,f0/7-24,g0/1-2

shutown

(1/2 point)
Step 2: Configure S3.

Configuration tasks for S3 include the following:

Configuration Item or Task Specification Points
Create the VLAN database Use Topology VLAN Key Table to create each of the listed VLANS. Name each VLAN.

VLAN 21

Name Accounting

Vlan 23

Name Engineering

Vlan 99

Name Management

exit

(1 point)
Assign the management IP address Assign the IPv4 address to the Management VLAN. Use the IP address assigned to S3 in the Topology diagram.

Int vlan 99

Ip address 192.168.99.3 255.255.255.0

No shut

exit

(1/2 point)
Assign the default-gateway Assign the first IP address in the subnet as the default-gateway.

Ip default-gateway 192.168.99.1

(1/2 point)
Force trunking on Interface F0/3 Use VLAN 1 as the native VLAN.

Int f0/3

Switchport mode trunk

Switchport trunk native vlan 1

(1 point)
Configure all other ports as access ports Use the interface range command.

Int range f0/1-2,f0/4-24,g0/1-2

Switchport mode access

(1/2 point)
Assign F0/18 to VLAN 23 Int f0/18

Switchport access vlan 23

(1/2 point)
Shutdown all unused ports Int range f0/1-2,f0/4-17,f0/19-24,g0/1-2

shutdown

(1/2 point)
Step 3: Configure R1.

Configuration tasks for R1 include the following:

Configuration Item or Task Specification Points
Configure 802.1Q subinterface .21 on G0/1 Description Accounting LAN

Assign VLAN 21.

Assign the first available address to this interface.

Int g0/1.21

Description vlan 21

Encapsulation dot1q 21

Ip addres 192.168.21.1 255.255.255.0

(1 point)
Configure 802.1Q subinterface .23 on G0/1 Description Engineering LAN

Assign VLAN 23.

Assign the first available address to this interface.

Int g0/1.23

Description vlan 23

Encapsulation dot1q 23

Ip address 192.168.23.1. 255.255.255.0

(1 point)
Configure 802.1Q subinterface .99 on G0/1 Description Management LAN

Assign VLAN 99.

Assign the first available address to this interface.

Int g0/1.99

Description vlan 99

Encapsulation dot1q 99

Ip address 192.168.99.1. 255.255.255.0

(1 point)
Activate Interface G0/1 Int g0/1

No shut

(1 point)
Step 4: Verify network connectivity.

Use the ping command to test connectivity between the switches and R1.

Use the following table to methodically verify connectivity with each network device. Take corrective action to establish connectivity if a test fails:

From To IP Address Ping Results Points
S1 R1, VLAN 99 address 192.168.99.1 successful (1 point)
S3 R1, VLAN 99 address 192.168.99.1 successful (1 point)
S1 R1, VLAN 21 address 192.168.21.1 successful (1 point)
S3 R1, VLAN 23 address 192.168.23.1 successful (1 point)

Instructor Sign-off Part 2: ______________________

Points: _________ of 18

Part 4: Configure RIPv2 Dynamic Routing Protocol

Total points: 14

Time: 15 minutes

Step 1: Configure RIPv2 on R1.

Configuration tasks for R1 include the following:

Configuration Item or Task Specification Points
Configure RIP Version 2 Router rip

Version 2

(1 point)
Advertise directly connected Networks

Assign all directly connected networks.

Do show ip route connected

Network 172.16.1.0

Network 192.168.21.0

Network 192.168.23.0

Network 192.168.99.0

(1 point)
Set all LAN interfaces as passive Passive-interface g0/1.21

Passive-interface g0/1.23

Passive-interface g0/1.99

(1 point)
Disable automatic summarization No auto-summary (1 point)
Step 2: Configure RIPv2 on R2.

Configuration tasks for R2 include the following:

Configuration Item or Task Specification Points
Configure RIP Version 2 Router rip

Version 2

(1 point)
Advertise directly connected Networks Note: Omit the G0/0 network.

Do show ip route connected

Network 10.10.10.10

Network 172.16.1.0

Network 172.16.2.0

(1 point)
Set the LAN (Loopback) interface as passive Passive-interface loopback 0 (1 point)
Disable automatic summarization No auto-summary (1/2 point)
Step 3: Configure RIPv2 on R3.

Configuration tasks for R3 include the following:

Configuration Item or Task Specification Points
Configure RIP Version 2 Router rip

Version 2

(1 point)
Advertise directly connected IPv4 Networks Do show ip route connected

Network 172.16.2.0

Network 192.168.4.0

Network 192.168.5.0

Network 192.168.6.0

(1 point)
Set all IPv4 LAN (Loopback) interfaces as passive Passive-interface loopback 4

Passive-interface loopback 5

Passive-interface loopback 6

(1 point)
Disable automatic summarization No auto-summary (1/2 point)
Step 4: Verify RIP information.

Verify that RIP is functioning as expected. Enter the appropriate CLI command to discover the following information:

Question Response Points
What command displays the RIP Process ID, Router ID, Routing Networks, and passive interfaces configured on a router? Show ip protocols (1 point)
What command displays only RIP routes? Show ip route rip (1 point)
What command displays the RIP section of the running-configuration? Show run | section router rip (1 point)

Instructor Sign-off Part 3: ______________________

Points: _________ of 14

Part 5: Implement DHCP and NAT for IPv4

Total points: 15

Time: 15 minutes

Step 1: Configure R1 as the DHCP server for VLANs 21 and 23.

Configuration tasks for R1 include the following:

Configuration Item or Task Specification Points
Reserve the first 20 IP addresses in VLAN 21 for static configurations Ip dhcp excluded-address 192.168.21.1 192.168.21.20 (1 point)
Reserve the first 20 IP addresses in VLAN 23 for static configurations Ip dhcp excluded-address 192.168.23.1 192.168.23.20 (1 point)
Create a DHCP pool for VLAN 21 Name: ACCT

DNS-Server: 10.10.10.10

Domain-Name: ccna-sa.com

Set the default gateway.

Ip dhcp pool ACCT

Network 192.168.21.0 255.255.255.0

Default-router 192.168.21.1

Dns-server 10.10.10.10

Domain-name ccna-sa.com

(1 point)
Create a DHCP pool for VLAN 23 Name: ENGNR

DNS-Server: 10.10.10.10

Domain-Name: ccna-sa.com

Set the default gateway.

Ip dhcp pool ENGIN

Network 192.168.23.0 255.255.255.0

Default-router 192.168.23.1

Dns-server 10.10.10.10

Domain-name ccna-sa.com

(1 point)
Step 2: Configure Static and Dynamic NAT on R2.

Configuration tasks for R2 include the following:

Configuration Item or Task Specification Points
Create a local database with 1 user account Username: webuser

Password: cisco12345

Privilege level: 15

 

Username webuser privilege 15 secret cisco12345

(1 point)
Enable HTTP server service Ip http server (1/2 point)
Configure the HTTP server to use the local database for authentication Ip http authentication local (1/2 point)
Create a static NAT to the Web Server Inside Global Address: 209.165.200.237

Ip nat inside source static 10.10.10.10 209.165.200.237

(1 point)
Assign the inside and outside interface for the static NAT Int g0/0

Ip nat outside

Int s0/0/0

Ip nat inside

Int s0/0/1

Ip nat inside

exit

(1 point)
Configure the dynamic NAT inside private ACL Access List: 1

Allow the Accounting and Engineering networks on R1 to be translated.

Access-list 1 permit 192.168.21.0 0.0.0.255

Access-list 1 permit 192.168.23.0 0.0.0.255

Allow a summary of the LANs (loopback) networks on R3 to be translated.

Access-list 1 permit 192.168.4.0 0.0.3.255

(1 point)
Define the pool of usable public IP addresses Pool Name: INTERNET

Pool of addresses include:

209.165.200.234 – 209.165.200.236

Ip nat pool INTERNET 209.165.200.234 209.165.200.236 netmask 255.255.255.248

(1 point)
Define the dynamic NAT translation Ip nat inside source list pool INTERNET (1 point)
Step 3: Verify DHCP and Static NAT.

Use the following tasks to verify that DHCP and Static NAT settings are functioning correctly. It may be necessary to disable the PC firewall for pings to be successful:

Test Results Points
Verify that PC-A acquired IP information from the DHCP server Go tp PC-A/desktop/ IP configuration/ check DHCP (1 point)
Verify that PC-C acquired IP information from the DHCP server Go tp PC-C/desktop/ IP configuration/ check DHCP (1 point)
Verify that PC-A can ping PC-C.

Note: It may be necessary to disable the PC firewall

Ping 192.168.23.21     successful (1 point)
Use a Web browser on the Internet Server to access the Web server (209.165.200.229/237). Login with Username: webuser, Password: cisco12345 (1 point)

Note: Verification of dynamic NAT will be performed in Part 6.

Instructor Sign-off Part 2: ______________________

Points: _________ of 15

Part 6: Configure NTP

Total points: 5

Time: 5 minutes

Configuration Item or Task Specification Points
Set the date and time on R2. March 5, 2016, 9 am

Clock set 09:00:00 5 March 2016

(1 points)
Configure R2 as a NTP Master. Stratum level: 5

Ntp master 5

(1 point)
Configure R1 as an NTP client. Server: R2

Ntp server 172.16.1.2

(1 point)
Configure R1 for periodical calendar updates with NTP time. Ntp update-calender

end

(1 point)
Verify the NTP configuration on R1. Show ntp associations (1 point)

Part 7: Configure and Verify Access Control Lists (ACLs)

Total points: 9

Time: 15 minutes

Step 1: Restrict access to VTY lines on R2.
Configuration Item or Task Specification Points
Configure a named access list to only allow R1 to telnet to R2 ACL Name: ADMIN-MGT

Ip access-list standard ADMIN-MGT

Permit host 172.16.1.1

(1 points)
Apply the named ACL to the VTY lines Line vty 0 15

Access-class ADMIN-MGT in

(1 point)
Allow telnet access to VTY lines Transport input telnet (1 point)
Verify ACL is working as expected R1: telnet 172.16.1.2

R3: telnet 172.16.1.2

(1 point)
Step 2: Enter the appropriate CLI command needed to display the following:
Command Description Student Input (command) Points
Display the matches an access-list has received since the last reset. R2: Show ip access-list (1 point)
Reset access-list counters. Clear ip access-list counters (1 point)
What command is used to display what ACL is applied to an interface and the direction that it is applied? R2: Show ip interface (1 point)
What command displays the NAT translations? Note: The translations for PC-A and PC-C were added to the table when the Internet Server attempted to ping these PCs in Step 2. Pinging the Internet Server from PC-A or PC-C will not add the translations to the table because of the way the Internet is being simulated on the network.

R2: show ip nat translations

From PC-A ping 209.165.200.238   successful

fromPC-C ping 209.165.200.238 successful

from PC-C URL: 209.165.200.238   successful

from PC-A URL: 209.165.200.238  successful

(1 point)
What command is used to clear dynamic NAT translations? R2: Clear ip nat translation *

Show ip nat translations

(1 point)

Instructor Sign-off Part 4: ______________________

Points: _________ of 9

Part 8: Cleanup

NOTE: DO NOT PROCEED WITH CLEANUP UNTIL YOUR INSTRUCTOR HAS GRADED YOUR SKILLS EXAM AND HAS INFORMED YOU THAT YOU MAY BEGIN CLEANUP.

Before turning off power to the routers, remove the NVRAM configuration files (if saved) from all devices.

Disconnect and neatly put away all cables that were used in the final.

Router Interface Summary Table
Router Interface Summary
Router Model Ethernet Interface #1 Ethernet Interface #2 Serial Interface #1 Serial Interface #2
1800 Fast Ethernet 0/0 (F0/0) Fast Ethernet 0/1 (F0/1) Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)
1900 Gigabit Ethernet 0/0 (G0/0) Gigabit Ethernet 0/1 (G0/1) Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)
2801 Fast Ethernet 0/0 (F0/0) Fast Ethernet 0/1 (F0/1) Serial 0/1/0 (S0/1/0) Serial 0/1/1 (S0/0/1)
2811 Fast Ethernet 0/0 (F0/0) Fast Ethernet 0/1 (F0/1) Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)
2900 Gigabit Ethernet 0/0 (G0/0) Gigabit Ethernet 0/1 (G0/1) Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)
Note: To find out how the router is configured, look at the interfaces to identify the type of router and how many interfaces the router has. There is no way to effectively list all the combinations of configurations for each router class. This table includes identifiers for the possible combinations of Ethernet and Serial interfaces in the device. The table does not include any other type of interface, even though a specific router may contain one. An example of this might be an ISDN BRI interface. The string in parenthesis is the legal abbreviation that can be used in Cisco IOS commands to represent the interface.

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