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学ぶことは遅すぎることはありません。あなたは引き続き勉強したい場合、F5CAB2認定試験資格証明書を取得する機会があります。そのほかに、多くの人がF5CAB2認定試験に合格しました後、成功し、幸せになりました。給料が高い仕事を見つけたからです。あなたは決してこの有難い機会をあきらめないで、早くF5CAB2学習材料を買いましょう！
質問 # 64
What command will assist the BIG-IP Administrator in finding the tmm routes when in the TMSH CLI?
正解：D
解説：
In the Traffic Management Shell (TMSH), there is a distinct difference between list and show commands.
* List Command: Used to view theconfigurationof an object (what is stored in the config file). list net route would show you the static routes you have manually configured.
* Show Command: Used to view thestatus, statistics, and real-time stateof an object.
* TMM Routes: Because the routing table (RIB/FIB) is a dynamic entity that includes both static routes and learned routes (such as those from a routing protocol or connected subnets), the show net route command is required to see the active routing table as it exists in the Traffic Management Microkernel (TMM).
Key Command Breakdown:
* show net route: Displays the active TMM routing table, including destination, gateway, and the status of the route.
質問 # 65
A development team needs to apply a software fix and troubleshoot one of its servers. The BIG-IP Administrator needs to immediately remove all connections from the BIG-IP system to the back-end server. The BIG-IP Administrator checks the virtual server configuration and finds that a persistence profile is assigned to it.
What should the BIG-IP Administrator do to meet this requirement? (Choose one answer)
正解：A
解説：
Comprehensive and Detailed Explanation (BIG-IP Administration - Data Plane Concepts):
In BIG-IP traffic management, persistence profiles cause existing client connections (and subsequent requests) to be repeatedly sent to the same pool member. When persistence is enabled, simply preventing new connections is not sufficient if the requirement is to immediately remove all existing connections.
Key behavior of pool member states:
Forced Offline
Immediately removes the pool member from load balancing.
Terminates all existing connections, regardless of persistence.
Prevents new connections from being established.
This is the correct state when urgent maintenance or troubleshooting is required.
Disabled
Prevents new connections from being sent to the pool member.
Allows existing connections to continue, which is not acceptable when persistence is configured and connections must be cleared immediately.
Offline (non-forced)
Similar to Disabled behavior depending on context.
Does not guarantee immediate termination of existing connections.
Manually deleting connections via the command line
Is unnecessary and operationally inefficient.
BIG-IP already provides a supported mechanism (Forced Offline) to cleanly and immediately remove traffic.
Conclusion:
To immediately remove all existing connections, including those maintained by persistence, the BIG-IP Administrator must set the pool member to a Forced Offline state. This directly satisfies the requirement without additional manual steps.
質問 # 66
Refer to the exhibit.
The network team creates a new VLAN on the switches. The BIG-IP Administrator creates a new VLAN and a Self IP on the BIG-IP device, but the servers on the new VLAN are NOT reachable from the BIG-IP device.
Which action should the BIG-IP Administrator take to resolve this issue? (Choose one answer)
正解：D
解説：
For BIG-IP to send or receive traffic on a VLAN, that VLAN must be bound to a physical interface or a trunk. Creating a VLAN object and a Self IP alone is not sufficient to establish data-plane connectivity.
From the exhibit:
The VLAN (vlan_1033) exists and has a tag defined.
A Self IP is configured and associated with the VLAN.
However, traffic cannot reach servers on that VLAN.
This indicates a Layer 2 connectivity issue, not a Layer 3 or HA issue.
Why assigning a physical interface fixes the problem:
BIG-IP VLANs do not carry traffic unless they are explicitly attached to:
A physical interface (e.g., 1.1), or
A trunk
Without an interface assignment, the VLAN is effectively isolated and cannot transmit or receive frames, making servers unreachable regardless of correct IP addressing.
Why the other options are incorrect:
A . Set Port Lockdown to Allow All
Port Lockdown controls which services can be accessed on the Self IP (management-plane access), not whether BIG-IP can reach servers on that VLAN.
B . Change Auto Last Hop to enabled
Auto Last Hop affects return traffic routing for asymmetric paths. It does not fix missing Layer 2 connectivity.
D . Create a Floating Self IP address
Floating Self IPs are used for HA failover. They do not resolve reachability issues on a single device when the VLAN itself is not connected to an interface.
Conclusion:
The servers are unreachable because the VLAN has no physical interface assigned. To restore connectivity, the BIG-IP Administrator must assign a physical interface (or trunk) to the VLAN, enabling Layer 2 traffic flow.
質問 # 67
When is an interface considered Available for use in a trunk?
正解：B
解説：
For an interface to be used as a physical member of a BIG-IP trunk, it must be free from conflicting Layer 2 assignments. In this question, the correct condition is that the interface is not assigned to a VLAN.
BIG-IP trunks aggregate multiple physical interfaces into one logical interface. The normal configuration sequence is to create the trunk from eligible physical interfaces and then assign the trunk itself to one or more VLANs. F5 documentation specifies that an interface assigned to a trunk must be an untagged interface and cannot simultaneously belong to another trunk. The Configuration utility therefore restricts which physical interfaces are presented as eligible trunk members.
An interface that is already directly participating in VLAN configuration is not treated as an available standalone interface for the intended trunk configuration. Instead, the physical interfaces are first aggregated, after which the resulting trunk becomes the VLAN member.
Option A is incorrect because a tagged interface has VLAN association and is not the prerequisite state for adding the physical interface to a trunk. Option B is also incorrect: an interface being administratively or operationally DOWN does not define trunk eligibility and may prevent it from becoming an active working link.
Study Guide Reference/Topics: Physical Interfaces; Trunk Configuration; Link Aggregation; VLAN Membership; Tagged and Untagged Interfaces; Interface Availability.
質問 # 68
A network administrator is planning to add a trunk to a single BIG-IP system. What does a trunk provide?
(Pick the 2 correct responses below)
正解：A、B
解説：
In the F5 BIG-IP ecosystem, atrunkis a logical grouping of two or more physical interfaces that the system treats as a single data path. This configuration is based on the Link Aggregation Control Protocol (LACP) or static link aggregation.
Trunks provide two primary benefits to the data plane:
* Increased Bandwidth:By aggregating multiple physical interfaces (e.g., combining two 10Gbps interfaces), the aggregate throughput of the logical connection is increased. This allows the BIG-IP to handle higher traffic volumes than a single interface could support.
* Link Redundancy:Trunks provide high availability at the physical layer. If one physical interface within the trunk fails or the cable is disconnected, the BIG-IP system automatically redistributes traffic across the remaining active interfaces in the trunk. This prevents a single cable or port failure from causing a network outage.
Why the other options are incorrect:
* Option C:While VLAN tags are often usedontrunks, the ability to use tagged VLANs is a property of theVLANconfiguration and 802.1Q tagging, not the trunk itself. A single interface can support tagged VLANs without being part of a trunk.
* Option D:Trunks are agnostic to the type of application traffic (such as VoIP) passing through them.
They operate at Layer 2 to provide a reliable pipe for any Layer 3+ traffic.
質問 # 69
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