Versa Networks的認證考試現在是很有人氣的考試。你已經取得了這個重要的認證資格嗎？比如，你已經參加了現在參加人數最多的VNX301考試了嗎？如果還沒有的話，你應該儘快採取行動了。你必須要拿到如此重要的認證資格。在這裏我想說的就是怎樣才能更有效率地準備VNX301考試，並且一次就通過考試拿到考試的認證資格。
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Configuration and Provisioning | 15% | - Zero-touch provisioning - Service deployment and onboarding - Template-based configuration |
| Topic 2: SD-WAN Services and Policies | 15% | - SLA monitoring and link optimization - QoS and bandwidth management - Application steering and traffic policies |
| Topic 3: Network Topologies and Routing | 15% | - Routing protocols and path selection - Hub-and-spoke, full-mesh, hybrid topologies - High availability and redundancy |
| Topic 4: Operations and Troubleshooting | 5% | - Monitoring and logging - Diagnostics and problem resolution |
| Topic 5: Versa SD-WAN Infrastructure | 20% | - Versa Controller and Analytics - Versa Director components and functions - Edge device management and deployment |
| Topic 6: Security Services | 10% | - VPN and encryption - Integrated firewall and IPS - Segmentation and threat protection |
| Topic 7: Underlay and Overlay Technologies | 20% | - Overlay architecture and concepts - Overlay connectivity and tunneling - Underlay network design and requirements |
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問題 #38
Examine the exhibit below.
According to the CGNAT pool configuration shown in the exhibit, which two statements are true? (Choose two.)
答案：A,D
解題說明：
The exhibit shows the Add CGNAT Pool configuration with the IP Address/Range option selected. The configured address range is named Visitors , with a low address of 192.168.10.100 and a high address of
192.168.10.150 . In CGNAT, this pool defines the translated source address resource used by matching NAT rules; it does not define the original inside source hosts. Therefore, matching sessions will have their source address translated to an address from this configured pool range, which makes option C correct. Versa's CGNAT configuration examples show that a rule matches original source and destination prefixes, and then attaches a translated source pool to perform NAT.
問題 #39
In an HA active-active deployment, one device has two WAN networks, INET-1 and MPLS-1 , and its peer also has two WAN networks, INET-2 and MPLS-2 . In this scenario, how many subinterfaces will be created on the cross-connect link between the devices by an HA active-active workflow?
答案：A
解題說明：
The correct answer is D . In a Versa HA active-active branch deployment, the cross-connect link between the two CPE devices is used to extend WAN transport reachability between the peers. Versa SD-WAN design documentation explains that, in an HA active-active design, a cross-connect cable between the two devices extends one device's transport VR to the other device and vice versa. For example, the documentation describes the cross-connect as extending the MPLS-Transport-VR to one device and the Internet- Transport-VR to the peer device.
In the question, there are four total WAN networks across the HA pair: INET-1 , MPLS-1 , INET-2 , and MPLS-2 . The HA active-active workflow must create separate logical subinterfaces on the cross-connect link for each WAN network so that each transport segment can be extended and kept logically separated across the two appliances. Therefore, the number of subinterfaces created on the cross-connect link equals the total number of WAN networks across the HA pair, which is four .
Options A, B, and C are incorrect because they undercount the number of required transport extensions. Two subinterfaces would only account for two WAN networks, but this design has four separate WAN transport networks.
問題 #40
A branch using DIA with CGNAT reports that new internet sessions intermittently fail. CGNAT pool counters show increasing out-of-ports errors, while out-of-address errors remain zero. What is the most likely problem?
答案：C
解題說明：
The correct answer is A . Versa CGNAT troubleshooting documentation includes per-pool and resource counters that show allocation behavior and failures. The counters include values such as bindings allocated, bindings freed, allocation failures, out-of-address errors, and out-of-ports errors. It also shows that CGNAT source-port resources are divided and distributed to worker threads by Versa RFD/RFM, and that allocated source-port ranges can be viewed using show rfm table src-port allocated.
If out-of-ports errors increase while out-of-address errors remain zero, the pool still has usable translated IP addresses, but the available port resource for NAT bindings is exhausted. This commonly occurs when too many concurrent sessions share a limited public IP or source-port range. The corrective action would be to expand the NAT resource, add more public translated IPs, adjust port allocation, or reduce excessive session usage.
A missing NAT IP pool would more likely produce out-of-address problems. A wrong zone match might prevent translation entirely, and OSPF in the LAN VR is unrelated to CGNAT port-resource exhaustion.
問題 #41
Examine the CLI output in the exhibit.
You are reviewing the OSPF adjacency on a VOS CPE, and the output is shown in the exhibit. In this scenario, what is the probable cause of the OSPF adjacency issue?
答案：C
解題說明：
The correct answer is B . The exhibit shows the OSPF neighbor in the exst state, which means Exchange Start . Versa documentation lists the OSPF neighbor state codes and identifies exst as "exchange start," followed by exchange, loading, and full. In normal OSPF adjacency formation, neighbors progress through initialization and two-way communication before they negotiate database exchange. If the neighbor becomes stuck in ExStart or Exchange, a common and highly probable cause is an MTU mismatch between the two OSPF peers. During database description packet negotiation, the peers must agree on parameters that allow LSDB exchange; an MTU mismatch can prevent the adjacency from advancing to Full.
Option A is less likely because an area mismatch usually prevents the neighbor relationship from forming correctly rather than leaving it stuck in ExStart. Option C is also incorrect because the neighbor has already progressed beyond early states, which indicates that bidirectional communication has occurred. Option D is not the best answer because dropping OSPF multicast 224.0.0.5 would typically prevent discovery or keep the adjacency in an earlier state, not specifically in ExStart.
Therefore, the probable cause is an interface MTU mismatch.
問題 #42
A VOS branch has two WAN circuits. You suspect the configured transport domain mapping is wrong because one link is not building the expected SD-WAN path. Which VSM control-plane command is most useful to check local WAN circuit information, transport domains, NAT status, and local tunnel-site details?
答案：C
解題說明：
The correct answer is A . Versa SD-WAN data-path troubleshooting documentation instructs administrators to connect to the VSM control plane with vsh connect vsmd and then use show vsm p2mp local-tunnel-sites 0 to check the status of local site objects. The example output includes the local site key, neighbor IP, site type, site name, branch ID, tenant ID, and detailed WAN link information. It also shows fields such as WAN local VRF ID, WAN local link name, circuit information, link ID, behind-NAT status, shaping rate, public and private addresses, link flags, transport domain, and SLA interval.
This command is therefore highly relevant when validating whether the local SD-WAN site has learned and built the correct WAN transport objects for overlay tunnel creation. If a circuit is mapped to the wrong transport domain or has incorrect NAT/public/private address state, the local-tunnel-site output is one of the best places to confirm it.
The other commands are useful for software version, CGNAT summary, or CPU usage, but they do not show the detailed SD-WAN local tunnel-site transport mapping.
問題 #43
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