WebAssembly.

Wasm in browsers and servers, WASI, component model, and language targets. Covers 8 sub-skills.

• WebAssembly · 1 of 3

  Linear Memory & Shared Memory

  What is the size of one WebAssembly memory page?

  A64 KB (65,536 bytes)B1 MB (1,048,576 bytes)C16 KB (16,384 bytes)D4 KB (4,096 bytes)

• WebAssembly · 2 of 3

  Linear Memory & Shared Memory

  What happens when a WebAssembly program accesses memory outside its allocated linear memory bounds?

  AThe access wraps around to the beginning of linear memoryBZero bytes are returned for out-of-bounds readsCThe memory is automatically grown (silently) to fitDA trap (runtime error) is raised and execution halts

• WebAssembly · 3 of 3

  Wasm at the Edge

  An edge runtime advertises 'sub-millisecond cold starts' for Wasm components. Which engine optimization most directly enables that on Wasmtime?

  AShared linear-memory pages copy-on-write between tenant instancesBPer-request module caching keyed by SHA-256 of the binary blobCLazy streaming compilation triggered by the first invocation tierDPre-compiled .cwasm artifacts loaded with the pooling allocator