VLAN misconfiguration is one of the top sources of connectivity failures in real networks and one of the most tested areas on the CCNA. These questions cover VLAN access ports, 802.1Q trunks, native VLANs, and router-on-a-stick or layer-3 switch inter-VLAN routing.
Start Scenario PracticeYou have configured a Cisco Unified CM Route List with two Route Groups: one containing a SIP trunk to Provider A and another containing a SIP trunk to Provider B. You want calls to be attempted to Provider A first, and only if that fails, to Provider B. Which Route List configuration ensures this behavior?
Explanation: To route calls to Provider A first and then Provider B only on failure, the Route List must use the Top Down distribution algorithm and list the Route Group for Provider A before Provider B. Top Down tries each Route Group in order, providing sequential failover. Other algorithms like Circular or Longest Idle do not provide this strict primary/secondary behavior.
A Cisco IOS XE voice gateway is configured with two POTS dial peers pointing to the same FXO port. Dial peer 10 matches destination pattern 911, and dial peer 20 matches destination pattern 9T. An inbound PSTN call arrives and is matched to a VoIP dial peer that forwards it to the gateway's FXO trunk. Which dial peer will the gateway use for the outbound POTS leg, and why?
Explanation: Dial-peer matching on Cisco IOS voice gateways uses a specificity comparison: an exact digit string outranks a pattern containing wildcards. Because 911 is fully explicit and 9T contains the T wildcard, the gateway selects the peer with destination pattern 911 for the outbound POTS leg. This behavior lets engineers attach distinct settings, such as different trunk groups or calling-party transformations, to emergency calls while still allowing all other dialed numbers to use the general pattern.
A collaboration engineer is designing a SIP trunk between Cisco Unified Communications Manager (CUCM) and Cisco Unified Border Element (CUBE). The engineer must ensure that calls are routed correctly and that CUCM can send calls to CUBE. Which element should be configured on CUCM to point to CUBE as the next hop for calls destined to the ITSP?
Explanation: To route calls from CUCM to CUBE, you configure a SIP trunk on CUCM with the destination address of CUBE. This trunk is then referenced by a route group, route list, and route pattern. When a call matches the route pattern, CUCM sends the call to CUBE via the SIP trunk. The trunk itself is the element that points to CUBE as the next hop.
A Cisco Unified CM administrator is troubleshooting a call that fails with a 'No Route to Destination' cause code. The called number is 2001, which is an internal extension on a remote cluster. The local cluster has a SIP trunk to the remote cluster and a route pattern of 2XXX pointing to that trunk. The SIP trunk is up, but the call fails. What is the most likely cause?
Explanation: The most likely cause is that the route pattern 2XXX is in a partition that is not included in the calling search space of the dialing device. Without the partition in the CSS, Unified CM cannot match the pattern, resulting in 'No Route to Destination'. Verifying the device's CSS and partition assignments resolves this issue.
You are configuring a SIP trunk between CUCM and a CUBE. Which setting is critical to ensure that the SIP signaling is encrypted?
Explanation: The SIP Trunk Security Profile in CUCM defines the security settings for a SIP trunk, including whether TLS is used for signaling encryption and whether digest authentication is enabled. To ensure SIP signaling is encrypted, the profile must be configured with a 'Secure' transport (TLS) and applied to the trunk. This is the critical setting that controls encryption of SIP messages between CUCM and CUBE.
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Practice all VLAN and Inter-VLAN Routing ScenariosVLAN misconfiguration is one of the top sources of connectivity failures in real networks and one of the most tested areas on the CCNA. These questions cover VLAN access ports, 802.1Q trunks, native VLANs, and router-on-a-stick or layer-3 switch inter-VLAN routing. These appear throughout the CLCOR and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the CLCOR. Practicing each scenario type ensures you're ready for any format.
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