Unreal Engine Unreal Engine Networking & Multiplayer 1 — Questions and Answers
Question 1: What is the default networking architecture used in Unreal Engine multiplayer games?
- Peer-to-Peer
- Client-Server (Correct answer)
- Distributed Mesh
- Broadcast Network
Correct answer: Client-Server
Unreal Engine uses a Client-Server model where the server is authoritative and clients send input while receiving replicated state.
Question 2: Which AActor property must be set to true in Unreal Engine to enable replication for that actor?
- bIsReplicated
- bNetworkActor
- bReplicates (Correct answer)
- bSyncToClients
Correct answer: bReplicates
Setting bReplicates = true on an AActor tells Unreal Engine to synchronize that actor's replicated properties and RPCs across the network.
Question 3: What does RPC stand for in Unreal Engine networking?
- Remote Procedure Call (Correct answer)
- Replicated Property Channel
- Remote Player Controller
- Replicated Physics Component
Correct answer: Remote Procedure Call
RPC stands for Remote Procedure Call, which allows functions to be executed on a remote machine (server or client) over the network.
Question 4: Which RPC type in Unreal Engine is guaranteed to execute on the server, regardless of which machine calls it?
- Client RPC
- NetMulticast RPC
- Server RPC (Correct answer)
- Reliable RPC
Correct answer: Server RPC
A Server RPC (marked with the Server specifier) always runs on the server, making it ideal for sending player input or requests to the authoritative machine.
Question 5: In Unreal Engine multiplayer, where does the GameMode exist?
- On all clients and the server
- Only on the server (Correct answer)
- Only on the owning client
- On the listen server host only
Correct answer: Only on the server
GameMode only exists on the server because it governs authoritative game rules; clients access game state through GameState instead.
Question 6: What is 'Net Relevancy' in Unreal Engine?
- The latency measurement between client and server
- A filter determining which actors are replicated to which clients (Correct answer)
- The priority order for loading networked assets
- The maximum player count for a session
Correct answer: A filter determining which actors are replicated to which clients
Net Relevancy is a per-actor filter that allows the engine to skip replicating actors to clients that are too far away or otherwise irrelevant, reducing bandwidth.
Question 7: Which Unreal Engine class handles player-specific connection state, input, and exists only on the server and the owning client?
- PlayerState
- GameMode
- PlayerController (Correct answer)
- Pawn
Correct answer: PlayerController
PlayerController manages player input and connection and is instantiated on the server and the owning client, unlike PlayerState which is replicated to all clients.
Unreal Engine Unreal Engine Networking & Multiplayer 1
What is the default networking architecture used in Unreal Engine multiplayer games?