Cisco Updated 300-430 Exam Questions and Answers by dax

In Quality of Service (QoS) for networking, Class of Service (COS) and Differentiated Services Code Point (DSCP) are used for traffic classification and prioritization. Voice traffic is generally given high priority due to its sensitivity to delay and requires proper tagging to maintain quality over the network.

The correct mapping for voice traffic, according to best practices, is a COS value of 5 mapped to a DSCP value of 46. This is because DSCP 46 corresponds to Expedited Forwarding (EF), which is typically used for voice traffic prioritization in IP networks.

The exhibit shows the output from a command on a network device that displays the current mappings between COS values and DSCP values. The mapping that needs modification for correct voice traffic tagging can be identified by looking at the standard practice for voice QoS, which uses a COS value of 5 mapped to a DSCP value of 46.

References := ( CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide )

When upgrading a Cisco AireOS WLC from version 7.3 to 8.9, it’s crucial to configure ACLs that allow necessary traffic for Cisco Central Web Authentication (CWA). The correct ACLs to configure are:

B. Permit 0.0.0.0 0.0.0.0 UDP DNS any: This ACL allows DNS queries from any source to any destination, which is essential for resolving domain names during the upgrade process.

E. Permit 0.0.0.0 0.0.0.0 UDP any any: This ACL permits all UDP traffic from any source to any destination, ensuring that services relying on UDP can continue to function during the upgrade.

These ACLs ensure that critical services like DNS resolution are not interrupted during the upgrade process, which could otherwise lead to system instability or failure to access network resources. References := ( CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide )

In a Cisco Wireless LAN Controller (WLC), AP groups are used to manage the distribution of WLANs to different access points (APs). By configuring AP groups, an engineer can specify which WLANs are broadcasted by which APs. This allows for the creation of multiple WLANs across different APs without the need to create new interfaces for each WLAN. AP groups provide the flexibility to control WLAN availability based on location or other criteria, ensuring that only the intended WLANs are available through specific APs.

To ensure reliable streaming of multicast video over a wireless link, it’s essential to optimize the multicast settings on the controller. Option B, implementing video-stream for the multicast video on the controller, is a feature that optimizes the delivery of multicast streams by converting them into unicast streams for specific clients, thus improving reliability. Option C, allowing multicast-direct to work correctly, involves enabling multicast-direct globally, which allows multicast packets to be sent directly to clients without the need for them to subscribe to a specific multicast group, enhancing efficiency and reliability. References: CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide