Pick all that apply

• 1Choice 1.

  TCP establishes a connection with a 3-way handshake and guarantees ordering and retransmission, and HTTP/1.1, HTTP/2, and ordinary URLSession requests run over TCP (plus TLS)

• 2Choice 2.

  UDP has no connection, ordering, or retransmission guarantees, so its overhead is small, and it's used where latency matters more, like HTTP/3 (QUIC), VoIP, and real-time games

• 3Choice 3.

  ARP is the protocol that finds the MAC address matching an IP address within the same local network, and a data link layer frame is the delivery unit that carries MAC addresses in its header between neighboring devices

• 4Choice 4.

  UDP is unreliable, so iOS apps can't use it, and NWConnection in Network.framework only supports TCP

• 5Choice 5.

  TCP routes to the destination with MAC addresses alone, without IP addresses, so ARP belongs to the transport layer