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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Data Plane Concepts |
| Exam Number: | F5CAB2 |
| Available Languages: | English |
| Real Exam Qty: | 30 |
| Exam Duration: | 30 minutes |
| Exam Price: | $50 USD |
| Passing Score: | Not officially disclosed |
| Related Certifications: | F5 Certified Administrator, BIG-IP |
| Exam Format: | Scenario-based, Multiple choice |
| Certificate Validity Period: | 3 years |
| Recommended Training: | BIG-IP Administration Training Courses |
| Exam Registration: | F5 Education Portal Pearson VUE Certiverse |
| Sample Questions: | F5 F5CAB2 Sample Questions |
| Exam Way: | Online proctored (Certiverse) / In-person (Pearson VUE centers) |
| Pre Condition: | No mandatory prerequisites; can take in any order with other F5CAB exams |
| Official Syllabus URL: | https://education.f5.com/exams/big-ip-administration-data-plane-concepts |
如果你正在準備 F5CAB2 考試，為 F5CAB2 認證做最後衝刺，又苦於沒有絕對權威的考試真題模擬。很多考生現在都用 F5 F5CAB2 考題作為參加F5CAB2 考試最快捷，最信任的方式。擺正好心態，認真閱讀准備好的 F5CAB2 考題，考試時心中不要慌，任何一場考試，都是與考生在進行心理戰的准備，遇到難的題目先不要去管，調整好心態准備應戰下一條題目。加上之前准備充足獲取 F5CAB2 認證應該是沒有問題的。
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問題 #46
The BIG-IP Administrator wants to provide quick failover between the F5 LTM devices that are configured in an HA Pair with a single traffic-group. The BIG-IP Administrator wants to implement the Mac Masquerade feature for this quick failover and run this command: tmsh modify /cm traffic-group traffic-group-1 mac 02:
12:34:56:00:00. However, the Network Operations team has identified an issue with the use of the same MAC address being used within different VLANs. As a result of this, the BIG-IP Administrator must implement the Per-VLAN Mac Masquerade in order to have a unique MAC address on each VLAN: tmsh modify /sys db tm.
macmasqaddr_per_vlan value true. What would be the resulting MAC address on a tagged VLAN of 1501?
答案：B
解題說明：
MAC Masquerade allows a traffic group to use a shared MAC address to speed up failover. When the system DB variable tm.macmasqaddr_per_vlan is enabled, the BIG-IP generates a unique MAC address for each VLAN by algorithmically modifying the base MAC address using theVLAN ID.
The calculation forVLAN 1501works as follows:
* Base MAC:The administrator set the base to 02:12:34:56:00:00.
* VLAN ID Conversion:The decimal VLAN ID (1501) must be converted into hexadecimal.
* $1501 \div 16 = 93$ remainder13(Din hex)
* $93 \div 16 = 5$ remainder13(Din hex)
* $5 \div 16 = 0$ remainder5
* Result: $1501$ (Decimal) =05DD(Hex).
* Substitution:The BIG-IP replaces the last two octets of the base MAC address with the hexadecimal representation of the VLAN ID.
* Final Result:02:12:34:56:05:dd.
問題 #47
A BIG-IP Administrator assigns the default http health monitor to a pool that has three members listening on port 80. When the administrator connects to each pool member via the CURL utility, two of the members respond with a status of 404 Not Found while the third responds with 200 OK. What will the pool show for member availability?
答案：D
解題說明：
The behavior of a health monitor is determined by itsSend StringandReceive String.
* Default HTTP Monitor:The pre-configured default HTTP monitor on a BIG-IP system has an empty Receive String.
* Success Criteria:When the Receive String is blank, the BIG-IP system considers the health check successful if it receivesany valid HTTP responsefrom the server.
* Status Code Interpretation:Because a 404 Not Found is a valid HTTP status code (it is a properly formatted response from a running web server process), the BIG-IP interprets this as the application being "alive".
* Result:All three members (including the two returning 404s and the one returning 200) will be marked asUP/Available(Green).
問題 #48
A BIG-IP Administrator assigns the default HTTP health monitor to a pool that has three members listening on port 80. When the administrator connects to each pool member using the curl utility, two of the members respond with a status of 404 Not Found, while the third responds with 200 OK. What will the pool show for member availability? (Choose one answer)
答案：C
解題說明：
In BIG-IP LTM, health monitors are used to determine the availability of pool members and directly influence traffic flow decisions in the data plane.
Key characteristics of the default HTTP monitor according to BIG-IP Administration Data Plane Concepts:
* Sends an HTTP request (typically GET /)
* Expects an HTTP response code of 200 OK
* Any response other than 200 is treated as a monitor failure
* A failed monitor causes the pool member to be marked offline (down)
In this scenario:
* Two pool members return 404 Not Found
* A 404 response indicates that the requested object was not found
* This does not meet the success criteria of the default HTTP monitor
* These two members are therefore marked offline
* One pool member returns 200 OK
* This matches the expected response
* The member is marked online
Resulting Pool Member Availability:
* 2 members: Offline
* 1 member: Online
Why the Other Options Are Incorrect:
* B - 404 responses are not considered healthy by the default HTTP monitor
* C - At least one member responds with the expected 200 OK
* D - Members returning 404 responses fail the monitor and cannot be marked online Key Data Plane Concept Reinforced:
BIG-IP health monitors make binary availability decisions based strictly on configured success criteria. For HTTP monitors, response codes matter-404 is a failure, even if the service is technically reachable.
問題 #49
What is required for a virtual server to support clients whose traffic arrives on the internal VLAN and pool members whose traffic arrives on the external VLAN?
答案：C
解題說明：
4647
Virtual Servers have a setting calledVLAN and Tunnel Trafficwhich defines where the BIG-IP "listens" for new connections.4849
* Ingress Logic:A virtual server is an entry point. It must be enab50led on the VLAN where theClient resides. If a client is on the "51Internal" VLAN, the Virtual Server must be enabled there to receive the traffic.
* Egress Logic:The BIG-IP system uses theTMM Routing TableandSelf-IPsto reach pool members. It doesnotneed the Virtual Server to be "enabled" on the destination VLAN (External) to send traffic there.
* Default Behavior:By default, Virtual Servers are enabled on "All VLANs." However, if restricted for security, the administrator must ensure the Virtual Server is active on the client-facing (ingress) VLAN.
問題 #50
When using the setup utility to configure a redundant pair, you are asked to provide a "Failover Peer IP".
Which address is this?
答案：D
解題說明：
When establishing a redundant pair, each device must know where to send its health heartbeats and sync data.
* The Peer IP: The Failover Peer IP is the IP address belonging to the other BIG-IP device in the HA pair. This is typically a34 Self-IP on a dedicated "HA" or "Internal" VLAN, or the Management IP.
* Purpose: It identifies the destination for the "Heartbeat" (the "Are you alive?" check).
* Setup Context: During the initial setup, you tell Device A to look for Device B at its "Failover Peer IP," and you tell Device B to look for Device A at its respective "Failover Peer IP."
問題 #51
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