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질문 # 62
In a pool there are 2 pool members out of the 5 members that are older servers. The number of connections these can handle is less than the other 3 pool members. Which load balancing method would allow more traffic to be directed to the newer servers? (Choose one answer)
정답：B
설명：
When a pool contains servers with heterogeneous hardware capabilities (differing CPU, RAM, or connection limits), a static load balancing method like Round Robin is ineffective because it distributes requests equally, regardless of the server's capacity. To optimize traffic distribution for newer, more powerful servers, a dynamic or weighted method is required.
* Weighted Least Connections (member): This is the ideal method for this scenario. It combines two factors:
* Least Connections: It first checks the current active connection count to ensure traffic goes to the least busy server.
* Weight (Ratio): It allows the administrator to assign a "Ratio" value to each pool member. Newer servers can be assigned a higher ratio (e.g., 3) while older servers are assigned a lower ratio (e.g.,
1). The BIG-IP system uses these weights to disproportionately favor the newer servers even when connection counts are similar.
* Why other options are incorrect:
* Global Availability: This is primarily a GSLB (Global Server Load Balancing) or specific LTM priority group concept where traffic is sent to the first available member in a list until it fails, then moves to the next. It does not load balance based on capacity.
* Round Robin: This passes each new connection request to the next server in line, treating the old and new servers exactly the same.
* Least Connections (member): While this sends traffic to the server with the fewest active connections, it assumes all servers are equal. If an old server and a new server both have 10 connections, they are treated as equally capable of taking the 11th, which is not true in this scenario.
질문 # 63
A BIG-IP Administrator uses backend servers to host multiple services per server. There are multiple virtual servers and pools defined, referencing the same backend servers.
Which load balancing algorithm is most appropriate to have an equal number of connections on each backend server? (Choose one answer)
정답：C
설명：
In this scenario, each backend node (server) hosts multiple services and is referenced by multiple pools and virtual servers. The goal is to ensure an equal number of total connections per backend server, regardless of how many pool members (services/ports) exist on that server.
According to the BIG-IP Administration: Data Plane Configuration documentation:
Least Connections (node) tracks the total number of active connections to a node across all pool members and services.
This algorithm ensures load distribution is balanced at the server level, not just at the individual service (member) level.
It is specifically recommended when:
Multiple pool members exist on the same backend server
Multiple virtual servers reference the same backend servers
Why the other options are incorrect:
B . Predictive (member)
Predictive algorithms are advanced and traffic-pattern based, but they operate at the member level and do not guarantee equal connections per server.
C . Least Connections (member)
This balances connections per pool member, which can overload a server hosting multiple members while still appearing "balanced" per member.
D . Predictive (node)
Although node-aware, predictive algorithms are less deterministic and not the best choice when strict equality of connections is required.
Correct Resolution:
Using Least Connections (node) ensures that each backend server carries an equal connection load across all services and pools.
질문 # 64
Refer to the exhibit.
A BIG-IP Administrator configures a Virtual Server to handle HTTPS traffic. Users report that the application is NOT working. Which additional configuration is required to resolve this issue?
정답：A
설명：
According to the provided exhibit, the "SSL Profile (Client)" section in the Virtual Server configuration is empty. For a BIG-IP system to process HTTPS traffic, it must act as an SSL/TLS endpoint. This process, known as SSL Termination or SSL Offload, requires the assignment of a Client SSL Profile to the Virtual Server. Without this profile, the BIG-IP does not have the necessary certificate and private key information to perform the SSL handshake with the client's browser. Consequently, when a user attempts to connect via HTTPS, the TCP connection may establish, but the SSL handshake will fail because the BIG-IP will not know how to decrypt the incoming encrypted packets.
A Client SSL profile defines the ciphers, certificates, and keys that the BIG-IP uses to communicate securely with the client. In a standard HTTPS deployment, the BIG-IP decrypts the traffic and can then send it to the backend pool members either as plain text (header insertion/manipulation) or re-encrypt it using a Server SSL profile. While a Server SSL profile (Option C) is needed if the backend servers themselves require HTTPS, the initial failure for a user reaching a Virtual Server is almost always the lack of a Client SSL profile to terminate the user's connection. Changing the Service Port to HTTP (Option D) would be incorrect because the goal is to handle HTTPS traffic (typically port 443). Assigning the "clientssl" or a custom client-side profile from the "Available" list to the "Selected" list in the GUI is the mandatory step to make the Virtual Server operational for secure web traffic.
질문 # 65
A BIG-IP Administrator creates a new VLAN on BIG-IP Cluster Member A and attaches an interface to it.
Although the Auto Config Sync is in place, the new VLAN does NOT show up on Cluster Member B. What should the BIG-IP Administrator do to ensure the new VLAN is configured on each Cluster Member?
정답：B
설명：
In a BIG-IP High Availability (HA) environment, most configuration objects (Virtual Servers, Pools, iRules) are considered "shared" and are synchronized automatically between devices. However, network-level objects-specifically VLANs and Self IPs-are unique to the hardware and are generally not synchronized by the ConfigSync process.
This is intentional because two devices in a cluster may have different physical cabling or interface assignments. For example, Cluster Member A might use interface 1.1 for a specific VLAN, while Cluster Member B might use interface 1.2. Because the BIG-IP system cannot assume that the physical network topology is identical for both appliances, the administrator must Configure the new VLAN manually on Cluster Member B.
Once the VLAN is created manually on both devices with the exact same name, it can then be used to host
"shared" floating Self IP addresses or traffic groups that will synchronize. Failing to create the VLAN on the peer device will prevent the traffic group from failing over correctly, as the peer will not have the necessary Layer 2 broadcast domain defined to take over the traffic. Resetting Device Trust (Option D) is a drastic step for fix sync communication issues but will not change the fact that VLANs are non-syncable objects.
Enabling the interface (Option B) only affects the link status of Member A and has no impact on the configuration of Member B.
질문 # 66
A web server administrator informs the BIG-IP Administrator that web servers currently load-balanced require encrypted traffic. Starting next month, the web server administrator will offload SSL. Starting next month, the BIG-IP device will terminate SSL to reduce web server load. The BIG-IP device is already using Client SSL, Client port, and iRules on HTTP traffic. What actions should the BIG-IP Administrator take to achieve the desired configuration? (Choose one answer)
정답：A
설명：
To solve this requirement, we must distinguish between the two "legs" of an SSL connection in a BIG-IP environment: Client-side and Server-side.
* Current State (SSL Bridging): The administrator states the servers currently require encrypted traffic.
This means the BIG-IP is likely performing "SSL Bridging." In this setup, a Client SSL profile terminates encryption from the user, and a Server SSL profile re-encrypts the traffic before sending it to the back-end servers.
* Target State (SSL Offloading): The requirement is to "offload SSL" to reduce web server load. This means the BIG-IP will continue to handle the encryption for the users (keeping the Client SSL profile) but will communicate with the back-end servers using unencrypted HTTP.
Why Option A is correct:
* Remove the Server SSL profile: By removing this profile, the BIG-IP stops attempting to initiate an SSL
/TLS handshake with the pool members.
* Configure Pool Members to use HTTP: The service port for the pool members must be changed (typically from port 443 to port 80) so that the BIG-IP sends standard HTTP traffic to the servers.
Why other options are incorrect:
* B & D: These suggest removing the Client SSL profile. If you remove this, the users can no longer connect via HTTPS, which violates the requirement for encrypted communication between the users and the BIG-IP.
* C: Changing the Virtual Server to accept HTTP traffic would mean the user-to-BIG-IP connection is no longer encrypted, which is the opposite of SSL termination/offloading.
질문 # 67
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