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| Section | Weight | Objectives |
|---|---|---|
| ADC Application Objects & Virtual Servers | 20% | - Core ADC object fundamentals - Virtual server types
|
| Traffic Behavior Analysis | 35% | - Configuration-based traffic behavior
|
| High Availability Concepts | 15% | - Redundancy and failover basics - HA architecture and principles |
| Networking Components & Relationships | 30% | - Interfaces, trunks, VLANs, self-IPs, routes
|
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NEW QUESTION # 48
The diagram below shows the TCP connection setup for an application.
Which of the following virtual server types applies? (Choose one answer)
Answer: A
Explanation:
The diagram illustrates a specific TCP handshake sequence where the BIG-IP system acts as a transparent forwarder rather than a full proxy. The key indicators that identify this as aForwarding (IP) virtual server are as follows:
* Initial Packet Processing: The diagram explicitly states that the LTM evaluates the packet lookingonly at the destination IP address. This is the fundamental characteristic of a Forwarding IP virtual server, which uses the system's routing table to make forwarding decisions instead of load balancing to a pool of members.
* Handshake Sequence: Unlike aStandardvirtual server, which completes the three-way handshake with the client (SYN, SYN-ACK, ACK)beforeinitiating a separate connection to the server, the Forwarding IP virtual server passes the client's originalSYNpacket directly to the destination node.
* Response Timing: The BIG-IP system waits for theSYN-ACKfrom the destination node before it sends a SYN-ACK back to the client. It essentially "passes through" the handshake signals while still maintaining a state entry in the connection table to track the flow.
* Packet-by-Packet Logic: While it tracks the state, it does not perform address translation (unless SNAT is specifically configured) or deep packet inspection like a full proxy would.
Why other options are incorrect:
* Standard virtual server: A Standard virtual server is a "full proxy." It would finish the handshake with the client first and only then open a second, independent TCP connection to the backend server.
* Stateless virtual server: A stateless virtual server does not track connections in the connection table.
The diagram shows the system meticulously passing sequence numbers ($seq\_num$) and acknowledgment numbers ($ack\_num$) between the two sides, which requires stateful tracking of the TCP flow.
NEW QUESTION # 49
The BIG-IP appliance fails to boot. The BIG-IP Administrator needs to run the End User Diagnostics (EUD) utility to collect data to send to F5 Support.
Where can the BIG-IP Administrator access this utility?
Answer: B
NEW QUESTION # 50
A BIG-IP Administrator has a cluster of devices.
What should the administrator do after creating a new Virtual Server on device 1? (Choose one answer)
Answer: A
Explanation:
In a BIG-IP device service cluster, configuration objects such as virtual servers, pools, profiles, and iRules are maintained through configuration synchronization (config-sync).
Key BIG-IP concepts involved:
* Device Service Cluster (DSC)A cluster is a group of BIG-IP devices that share configuration data. One device is typically used to make changes, which are then synchronized to the rest of the group.
* Config-Sync Direction Matters
* Changes are made on a local device
* Those changes must be pushed to the group
* The correct operation is "Sync Device to Group"
Why C is correct:
* The virtual server was created only on device 1
* Other devices in the cluster do not yet have this object
* To propagate the new virtual server to all cluster members, the administrator must synchronize device
1 to the group
Why the other options are incorrect:
* A. Synchronize the settings of the group to device 1This would overwrite device 1's configuration with the group's existing configuration and may remove the newly created virtual server.
* B. Create a new cluster on device 1The cluster already exists. Creating a new cluster is unnecessary and disruptive.
* D. Create a new virtual server on device 2This defeats the purpose of centralized configuration management and risks configuration drift.
Conclusion:
After creating a new virtual server on a BIG-IP device that is part of a cluster, the administrator must synchronize the configuration from that device to the group so all devices share the same ADC application objects.
NEW QUESTION # 51
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)
Answer: C
Explanation:
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 AllPort 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 enabledAuto Last Hop affects return traffic routing for asymmetric paths. It does not fix missing Layer 2 connectivity.
* D. Create a Floating Self IP addressFloating 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.
NEW QUESTION # 52
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: A
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 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.
NEW QUESTION # 53
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