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Introducing Microsoft Windows sever 2008 r2 phần 7

Các khách hàng truyền lại tập tin yêu cầu ban đầu của nó đến máy chủ từ xa. Thời gian này, tuy nhiên, khách hàng bỏ qua định danh BranchCache từ tin nhắn yêu cầu. Các máy chủ từ xa, nhận được một tiêu chuẩn (không BranchCache) yêu cầu, trả lời bằng cách truyền các tập tin yêu cầu, như thể hiện trong đồ họa sau đây. | Branch Office Clients Distributed Cache Mode Step 3. Multicast with Metadata Step 4. No Replies Branch Office Client Remote Server Hosted Cache Mode Step 3. Forwarded Metadata Step 4. Negative Reply Branch Office Server 5. The client retransmits its original file request to the remote server. This time however the client omits the BranchCache identifier from the request message. 6. The remote server on receiving a standard non-BranchCache request replies by transmitting the requested file as shown in the following graphic. Remote Server Step 6. Reply with File Step 5. Non-BranchCache Request III11 Office Client 7. The client receives the requested file and on a Distributed Cache Mode installation stores the file in its local cache. On a Hosted Cache Mode installation the client sends a message to its local caching server using the BranchCache hosted cache protocol advertising the availability of its newly downloaded data. The local server then Using BranchCache CHAPTER 6 103 connects to the client downloads the data using the BranchCache retrieval protocol and stores it in the cache as shown in the following graphic. Remote Server Distributed Cache Mode Step 7. Client Caches File Locally Hosted Cache Mode Step 7. Client Advertises File Server Retrieves and Caches File Branch Office Server When another client subsequently requests the same data from the remote server the communication process is exactly the same up until step 4. In this case the client receives a reply from another computer either client or server depending on the mode indicating that the requested data is present in its cache. The client then uses the BranchCache retrieval protocol to download the data from the caching computer. For this and subsequent requests for that particular file the only WAN traffic required is the exchange of request messages and content metadata both of which are much smaller than the actual data file. Configuring a BranchCache Server Windows Server 2008 R2 and Windows 7 .