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NEW QUESTION # 38
An organization needs to deploy an HTTP application on a BIG-IP system. The requirements specify hardware acceleration to enhance performance, while HTTP optimization features are not required.
What type of virtual server and associated protocol profile should be used to meet these requirements?
(Choose one answer)
Answer: C
Explanation:
To select the correct virtual server type, an administrator must balance the need for L7 intelligence versus raw throughput and hardware offloading:
* Performance (Layer 4) Virtual Server: This type is designed for maximum speed. It uses the fastL4 profile, which allows the BIG-IP system to leverage the ePVA (Embedded Packet Velocity Accelerator) hardware chip. When a Performance (L4) virtual server is used, the system processes packets at the network layer (L4) without looking into the application payload (L7). This fulfills the requirement for hardware acceleration and avoids the overhead of HTTP optimization features, which are not needed in this scenario.
* Performance (HTTP) Virtual Server: While fast, this type uses the fasthttp profile to provide some L7 awareness and optimization (like header insertion or small-scale multiplexing). Since the requirement specifically states HTTP optimization is not required, the L4 variant is more efficient.
* Standard Virtual Server: This is a full-proxy type. While it offers the most features (SSL offload, iRules, Compression), it processes traffic primarily in the TMOS software layer (or via high-level hardware assistance), which is "slower" than the pure hardware switching path of the Performance (L4) type.
* Stateless Virtual Server: This is typically used for specific UDP/ICMP traffic where the system does not need to maintain a connection table. It is not appropriate for standard HTTP (TCP) applications requiring persistent sessions or stateful load balancing.
By choosing Performance (Layer 4) with the fastL4 profile, the organization ensures that the traffic is handled by the hardware acceleration chips, providing the lowest latency and highest throughput possible for their HTTP application.
NEW QUESTION # 39
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?
Answer: D
Explanation:
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 the VLAN ID.
The calculation for VLAN 1501 works 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.
$1501 \div 16 = 93$ remainder 13 (D in hex)
$93 \div 16 = 5$ remainder 13 (D in hex)
$5 \div 16 = 0$ remainder 5
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.
NEW QUESTION # 40
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?
Answer: B
NEW QUESTION # 41
When using the setup utility to configure a redundant pair, you are asked to provide a "Failover Peer IP". Which address is this?
Answer: A
NEW QUESTION # 42
Which of the virtual servers listed is selected when a packet is sourced from 10.10.1.1:34456 and destined to 10.16.2.100:445 arrives at the BIG-IP?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Data Plane Concepts/Course Guide/topics:
BIG-IP evaluates a new connection against eligible virtual servers using increasingly specific traffic-matching criteri a. F5's certification material states that, for BIG-IP 11.3 and later, virtual-server precedence considers destination address first, source address second, and service port third, with the most specific applicable listener taking precedence. F5, Inc.
Option B initially appears attractive because it specifies the exact destination 10.16.2.100:445. However, its source 192.168.5.1/32 restricts that virtual server to traffic originating from that single source. The actual packet originates from 10.10.1.1, so B is not an eligible match. F5 explicitly documents that the source address setting can restrict a virtual server to packets originating from a defined address or range.
Option C is eliminated because its destination is 10.120.6.10, not 10.16.2.100. Option D is the broad catch-all forwarding virtual (0.0.0.0:any, protocol any). Option A, however, is an applicable TCP forwarding virtual for the requested traffic and is preferred over the generic catch-all forwarding listener.
Study Guide Reference/Topics: Virtual Server Order of Precedence; Source Address Matching; Forwarding (IP) Virtual Servers; FastL4 Processing; Virtual Server Traffic Matching.
NEW QUESTION # 43
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