What is correct about the Resource Advisor (RAD) service on the Security Gateways?
What is correct about the Resource Advisor (RAD) service on the Security Gateways?
The Resource Advisor (RAD) service on Security Gateways involves both the kernel and user space. Initially, URL lookups are performed in the kernel cache. If the URL is not found, the kernel module will notify the client about the miss and forward the asynchronous request to the RAD user space module, which is responsible for the online categorization. Thus, the RAD service operates with both kernel space for initial lookups and kernel cache management, and user space for processing online categorizations.
If the URL is not found in the cache, the client issues an a- sync request using RAD for online categorization. The figure shows categorization process. 1. URL lookup initiated by the client. 2. URL lookup occurs in the kernel cache. 3. The kernel cache notifies the RAD kernel of hits and misses 4. RAD provides the status of the search to the client. 5. The client sends an a- sync request back to RAD if the URL was not found. 6. The a- sync request is forwarded to the RAD User space via the RAD kernel for online categorization. 7. The online detection service responds with categories and the kernel cache is updated. Source: CCTE R81.20 official study material