The show access-lists command in Cisco IOS is used to display all configured access control entries (ACEs) in every access list, both named and numbered. This command shows the complete content, including rules and hit counters.
Cisco IOS Command Reference – Access List Monitoring:
“Use show access-lists to view the complete list of all access control entries. This includes both standard and extended lists.”
Other options:
A: Invalid command syntax
C: show ip interface shows interface-level IP settings and ACL applications, but not full ACL content
D: show interface shows status and statistics, not ACL rules
Final Answer: BQUESTION NO: 134 [Cisco IOS – Console Access Configuration]
What does the command routerA(config)#line cons 0 allow you to perform next?
A. Set the Telnet password.
B. Shut down the router.
C. Set your console password.
D. Disable console connections.
Answer: C
The command line cons 0 enters the console line configuration mode. This is used to apply settings specific to the physical console line, such as setting a login password (via password and login commands).
Cisco IOS Configuration Guide – Line Console Mode:
“Use line console 0 to configure settings for the console line, including timeouts, password security, and logging behavior.”
René Meneses Study Guide – Device Access:
“Console access configuration begins with line console 0. It is followed by login and password commands.”
Other options:
A: Telnet is configured under line vty, not console
B: Router shutdown is done with reload or shutdown commands (not here)
D: Console cannot be disabled from line cons 0
Final Answer: CQUESTION NO: 135 [Switching – Spanning Tree Protocol]
How often are BPDUs sent from a Layer 2 device?
A. Never
B. Every 2 seconds
C. Every 10 minutes
D. Every 30 seconds
Answer: B
BPDU (Bridge Protocol Data Units) are messages exchanged by switches in a Spanning Tree Protocol (STP) topology to maintain loop-free Layer 2 networks. By default, switches send BPDUs every 2 seconds.
MTCNA Course Material – STP Operation:
“Switches send BPDUs to maintain spanning tree and detect topology changes. The default transmission interval is 2 seconds.”
Cisco STP Documentation:
“BPDUs are transmitted by the root bridge and propagated every 2 seconds by default, controlled by the hello-time timer.”
Other options:
A: Incorrect — BPDUs are essential for loop prevention
C & D: Not correct — default is 2 seconds, not minutes
Final Answer: BQUESTION NO: 136 [Routing Protocols – Passive Interface Behavior]
What does the passive command provide to dynamic routing protocols?
A. Stops an interface from sending or receiving periodic dynamic updates.
B. Stops an interface from sending periodic dynamic updates but not from receiving updates.
C. Stops the router from receiving any dynamic updates.
D. Stops the router from sending any dynamic updates.
Answer: B
In dynamic routing (e.g., RIP, OSPF, EIGRP), the passive-interface command stops routingadvertisements (outgoing updates) from being sent through the specified interface. However, the router still listens for incoming routing updates.
Cisco IOS Configuration Guide – Passive Interface:
“The passive-interface command prevents routing updates from being sent on an interface, while still allowing updates to be received.”
René Meneses MTCNA Guide – Passive Mode:
“It suppresses sending routing advertisements but does not block receiving updates on that interface.”
Other options:
A: Incorrect — it does not block receiving
C: Incorrect — it applies to interfaces, not globally
D: Also incorrect — it does not block all updates
Final Answer: B
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