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| Section | Objectives |
|---|---|
| Topic 1: Application Delivery Concepts | - SSL offloading concepts
|
| Topic 2: NAT and Address Translation | - SNAT and NAT concepts
|
| Topic 3: Load Balancing and Traffic Management | - Health monitoring
|
| Topic 4: BIG-IP System Architecture | - Traffic processing pipeline (data plane vs control plane)
|
| Topic 5: Traffic Policies and iRules | - iRules fundamentals
|
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問題 #18
A virtual server is listening at 10.10.1.100:80 and has the following iRule associated with it:
when HTTP_REQUEST { if { [HTTP::header UserAgent] contains "MSIE" }
{ pool MSIE_pool }
else { pool Mozilla_pool }
If
a user connects to http://10.10.1.100/foo.html and their browser does not specify a UserAgent, which pool will receive the request?
答案：A
問題 #19
Which of the following lists theorder of preference from most preferred to least preferredwhen BIG-IP processes and selects avirtual server? (Choose one answer)
答案：B
解題說明：
The BIG-IP system uses a specific precedence algorithm to determine which virtual server (listener) should process an incoming packet when multiple virtual servers might match the criteria. Since BIG-IP version
11.3.0, the system evaluates three primary factors in a fixed order of importance:
* Destination Address:The system first looks for the most specific destination match. A "Host" address (mask /32) is preferred over a "Network" address (mask /24, /16, etc.), which is preferred over a
"Wildcard" (0.0.0.0/0).
* Source Address:If multiple virtual servers have identical destination masks, the system then evaluates the source address criteria. Again, a specific source host match is preferred over a source network or a wildcard source.
* Service Port:Finally, if both destination and source specifications are equal, the system checks the port.
A specific port match (e.g., 80) is preferred over a wildcard port (e.g., or 0).
Following this logic, a virtual server configured with a specificdestination host, a specificsource host, and a specificservice portrepresents the highest level of specificity and thus the highest preference.
問題 #20
A BIG-IP Administrator configures remote authentication and needs to ensure that users can still log in even when the remote authentication server is unavailable. Which action should the BIG-IP Administrator take in the remote authentication configuration to meet this requirement? (Choose one answer)
答案：D
解題說明：
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
Although remote authentication (LDAP, RADIUS, TACACS+) is a control-plane / management-plane feature, it directly affects availability and resiliency of administrative access, which is a critical operational HA consideration.
How BIG-IP Remote Authentication Works:
BIG-IP can authenticate administrators against:
LDAP
RADIUS
TACACS+
When remote authentication is enabled, BIG-IP by default relies on the remote server for user authentication If the remote authentication server becomes unreachable, administrators may be locked out unless fallback is configured Why "Fallback to Local" Is Required:
The Fallback to Local option allows BIG-IP to:
Attempt authentication against the remote authentication server first
If the remote server is unreachable or unavailable, fall back to:
Local BIG-IP user accounts (admin, or other locally defined users)
This ensures:
Continuous administrative access
Safe recovery during:
Network outages
Authentication server failures
Maintenance windows
This behavior is explicitly recommended as a best practice in BIG-IP administration to avoid loss of management access.
Why the Other Options Are Incorrect:
A . Configure a second remote user directory
Provides redundancy only if both directories are reachable
Does not help if remote authentication as a whole is unavailable
B . Configure a remote role group
Maps remote users to BIG-IP roles
Does not affect authentication availability
D . Set partition access to "All"
Controls authorization scope after login
Has no impact on authentication success
Key Availability Concept Reinforced:
To maintain administrative access resiliency, BIG-IP administrators should always enable Fallback to Local when using remote authentication. This prevents lockouts and ensures access even during authentication infrastructure failures.
問題 #21
An application is configured so that the same pool member must be used for an entire session, and this behavior must persist across HTTP and FTP traffic. A user reports that a session terminates and must be restarted after the active BIG-IP device fails over to the standby device.
Which configuration settings should the BIG-IP Administrator verify to ensure proper behavior when BIG-IP failover occurs? (Choose one answer)
答案：A
解題說明：
This scenario combines session continuity, multiple protocols (HTTP and FTP), and HA failover behavior, which directly implicates persistence handling across devices and services.
Key Requirements Breakdown
Same pool member for entire session
Session must survive failover
Session must span multiple services (HTTP and FTP)
Why Persistence Mirroring + Match Across Services Is Required
Persistence Mirroring
Ensures persistence records are synchronized from the active BIG-IP to the standby BIG-IP.
Without mirroring:
After failover, the standby device has no persistence table
Clients are load-balanced again
Sessions break, forcing users to restart
Persistence mirroring is essential for session continuity during failover Match Across Services Allows a single persistence record to be shared across multiple virtual servers / protocols Required when:
HTTP and FTP must use the same pool member
Multiple services are part of a single application session
Together, these settings ensure:
Persistence survives device failover
Persistence is honored across HTTP and FTP
Why the Other Options Are Incorrect
A . Cookie persistence and session timeout
Cookie persistence only applies to HTTP and does not address FTP or failover synchronization.
B . Stateful failover and Network Failover detection
Stateful failover applies to connection state, not persistence records, and does not link HTTP and FTP sessions.
D . SYN-cookie insertion threshold and connection low-water mark
These are DoS / SYN flood protection settings, unrelated to persistence or HA behavior.
問題 #22
A BIG-IP system receives a client connection destined to 1.0.0.10:8080. Multiple virtual servers are configured on the system. Which virtual server will process the connection? (Choose one answer)
答案：C
解題說明：
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts documents:
BIG-IP uses a virtual server matching and precedence algorithm to determine which virtual server processes an incoming connection. This decision is made entirely in the data plane and is based on how specifically a virtual server matches the destination IP address and port.
BIG-IP Virtual Server Selection Rules (Simplified):
When multiple virtual servers could match a packet, BIG-IP selects the most specific match, using the following precedence:
Exact IP address and exact port
Exact IP address with wildcard port (port 0 / any)
Wildcard IP address with exact port
Wildcard IP address and wildcard port
Applying the Rules to This Scenario:
Incoming traffic destination: 1.0.0.10:8080
Option C: 1.0.0.10:8080
Exact IP match
Exact port match
Highest possible specificity
If the virtual server is available (green), it wins the match
Option B: 1.0.0.10:any
Exact IP match, but wildcard port
Lower priority than an exact IP + exact port match
Option D: 0.0.0.0:8080
Wildcard IP, exact port
Lower priority than an exact IP match
Option A: 0.0.0.0:any
Wildcard IP and wildcard port
Lowest priority, used only if no more specific virtual server exists
Final Determination:
Because a virtual server configured with destination 1.0.0.10:8080 exactly matches both the IP address and port of the incoming connection-and is available-it will always be selected to process the traffic.
Key Data Plane Concept Reinforced:
BIG-IP always processes traffic using the most specific matching virtual server. Exact destination IP and port matches take precedence over any wildcard or forwarding virtual server definitions.
問題 #23
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