Proto Buff JN0-423 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   How do you define a nested message type inside another message in a .proto file?

   • ABy defining the message in a separate file and importing it
   • BBy declaring the nested message inside the outer message's block
   • CBy prefixing the message name with the outer message name
   • DBy using the 'nested' keyword before the message definition
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2. 2foundation · easy

   In a .proto file, which field rule allows a field to appear zero or more times in a message?

   • Aoptional
   • Brequired
   • Cmap
   • Drepeated
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4. 3expert · hard

   A gRPC service has been using a .proto file with a message that has a required field 'device_id' (field 1). You are migrating to proto3 and need to maintain compatibility with existing clients that still use proto2. What is the correct way to handle the 'device_id' field in the new proto3 definition?

   • ADefine 'device_id' as a regular singular field in proto3, since proto3 does not support 'required'.
   • BKeep the field as 'required' in proto3 to maintain the same semantics.
   • CChange the field number to a new value to indicate it is now optional.
   • DRemove the field entirely and rely on the client to send it in a separate message.
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5. 4foundation · easy

   In generated Protocol Buffers code, which method is typically used to convert a message object into a byte array?

   • Aserialize()
   • BwriteBytes()
   • CtoByteArray()
   • Dencode()
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6. 5application · medium

   You are designing a .proto file for a gRPC service that manages routing policies. Each policy has a name and a set of match conditions. You need to model the match conditions as key-value pairs where the key is a string (e.g., 'protocol') and the value is a string (e.g., 'BGP'). Which field definition correctly models this?

   • Arepeated string match_conditions = 1;
   • Bmap<string, string> match_conditions = 1;
   • Cmessage MatchCondition { string key = 1; string value = 2; } repeated MatchCondition match_conditions = 1;
   • Doptional string match_conditions = 1;
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