Learn About Interconnecting Cisco Networking Devices, Part 2
By Certification Magazine —
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Reference:
Objective: Implement, verify and troubleshoot NAT and ACLs in a medium-size enterprise branch-office network.
Sub-objective: Configure and apply access control lists based on network filtering requirements.
Single answer, multiple-choice
Which Cisco Internetwork Operating System (IOS) command is used to apply an access list to an interface?
A. router(config)# ip access-group
B. router(config-if)# ip access-group
C. router(config)# ip access-list
D. router(config-if)# ip access-list
Answer:
B. router(config-if)# ip access-group
Tutorial:
The router(config-if)# ip access-group command is used to apply an access list to an interface. This command is issued in interface configuration mode. The syntax of the command is as follows:
router(config-if)# ip access-group {access-list-number | access-list-name} {out | in}
The parameters of the command are as follows:
- out|in: Specifies where the access list will be applied on the router. The out value will cause the router to apply the access list to all outgoing packets. The in value will cause the router to apply the access list to all incoming packets.
- access-list-number: Specifies the number of an access list.
- access-list-name: Specifies the name of the access list.
The router(config)# ip access-group command is incorrect because this command should be issued in interface configuration mode.
The router(config)# ip access-list command is incorrect because this command is used to define an access list by name. The router(config-if)# ip access-list command is incorrect because this command is issued in global configuration mode, and is used to define an access list by name.
References:
Cisco > Cisco IOS Security Command Reference > icmp idle-timeout through ip http ezvpn > ip access-group
CCNA ICND2 Official Exam Certification Guide, Chapter 6: IP Access Control Lists, pages 238-244.
Objective: Implement and verify WAN links.
Sub-objective: Configure and verify frame relay on Cisco routers.
Multiple answer, multiple-choice
What three local management interface (LMI) types are supported on Cisco routers? (Choose three.)
A. IETF
B. ANSI
C. Cisco
D. Q933a
E. IEEE 802.11
Answer:
B. ANSI
C. Cisco
D. Q933a
Tutorial:
ANSI, Cisco and Q933a are the supported LMI types on Cisco routers.
LMI is used locally between the frame relay data terminal equipment (DTE) and the frame relay data circuit-terminating equipment (DCE). LMI information originating on one frame relay DTE will not be propagated across the carrier network to a remote frame relay DTE.
MI is processed only between the frame relay DTEs and DCEs. LMI is used for management purposes and allows two directly connected devices to share information about the status of virtual circuits (VCs), as well as their configuration. Three different standards are defined for LMI and its interaction with a frame relay DTE and DCE:
- ANSI: ANSI's Annex D standard, T1.617.
- Cisco: The Gang of Four, for the four companies that developed it: Cisco, DEC, StrataCom, and NorTel (Northern Telecom). This standard is commonly referred to as Cisco’s LMI.
- Q933a: ITU-T's Q.933 Annex A standard.
Cisco devices use Cisco as the default LMI type.
The option IETF is incorrect. IETF is a type of encapsulation for frame relay.
The option IEEE 802.11 is incorrect. IEEE 802.11 is an IEEE standard for wireless networks.
References:
Cisco > Cisco IOS XR Interface and Hardware Component Configuration Guide, Release 3.6 > Frame Relay Configuration on Cisco IOS XR Software
CCNA ICND2 Official Exam Certification Guide, Chapter 13: Frame Relay Concepts, pages 467-468.
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