The main purpose of a code review is to identify and review errors, ensuring code quality and adherence to coding standards. It involves evaluating the code for bugs, security vulnerabil i ties, and performance issues, and discussing potential improvements with the team. This co l laborative process helps catch errors early, fosters knowledge sharing, and improves the overall quality of the codebase.

In the provided sequence diagram, each call must complete before the next one can proceed, indicating that the calls are synchronous. Synchronous calls block further execution until the response is received, maintaining a sequential order of operations.

Synchronous Nature : The diagram shows each function call being made and then waiting for a callback before proceeding to the next step.

Blocking Behavior : Each interaction completes fully before the next one starts, which is characteristic of synchronous operations.

Option C correctly identifies that all the calls shown in the sequence diagram are synchronous.

In the given network topology, the load balancer ' s primary role is to distribute incoming r e quests to the application servers. This ensures that no single server is overwhelmed, and it helps in providing high availability and reliability for the hosted applications.

Private IP addresses are used within private networks and are not unique globally. They can be reused in different private networks without conflict.

Non-unique Addresses : Private IP addresses do not have to be unique globally, allo w ing them to be reused in different networks.

Repetition in Local Networks : They can be repeated within different local networks as they are not routable on the public Internet.

Options C and D correctly describe properties of private IP addresses.

In JSON (JavaScript Object Notation), data structures are represented using arrays and objects. A Python Tuple, which is an ordered and immutable collection of items, is best represented by a JSON array. JSON arrays are ordered lists of values, making them the closest equivalent to Python Tuples.

Object : In JSON, an object is a collection of key/value pairs.

Array : In JSON, an array is an ordered list of values.

Dict : In Python, a dict (dictionary) is a collection of key/value pairs.

Collection : General term for a group of items.

Thus, a Python Tuple would be represented as a JSON array.

synchronous : Code execution must wait for an API call to return before continuing.

asynchronous : Code execution does not need to wait for an API call to return before continuing.

REST : Data is called indirectly using generic HTTP methods such as GET, POST, PUT, and DELETE.

RPC : Calls to request a service from a remote server must execute the same way as a request to the local system.

Comprehensive Detailed Step by Step Explanation with References

Synchronous :

Explanation : In a synchronous API call, the client must wait for the server to process the request and return a response before it can proceed with further execution.

Mapping : " Code execution must wait for an API call to return before continuing. "

Asynchronous :

Explanation : In an asynchronous API call, the client can continue processing other tasks while waiting for the server to respond. This improves the efficiency and responsiveness of the application.

Mapping : " Code execution does not need to wait for an API call to return before co n tinuing. "

REST (Representational State Transfer) :

Explanation : REST is an architectural style for designing networked applications. It relies on a stateless, client-server communication protocol, typically HTTP. RESTful APIs use standard HTTP methods (GET, POST, PUT, DELETE) to perform operations on resources.

Mapping : " Data is called indirectly using generic HTTP methods such as GET, POST, PUT, and DELETE. "

RPC (Remote Procedure Call) :

Explanation : RPC is a protocol that one program can use to request a service from a program located on another computer in a network. The calls are made in the same way as a local function call.

Mapping : " Calls to request a service from a remote server must execute the same way as a request to the local system. "

The pip freeze command is used to output installed packages in the current environment and their versions. The > operator redirects this output to a file, in this case, requirements.txt .

pip freeze: Outputs the list of installed packages and their versions.

Redirection: The > operator is used to redirect the output to a file.

Option B is correct as it uses the > operator to redirect the output of pip freeze to requir e ments.txt .

Rate limiting is a technique to control the rate of incoming and outgoing traffic to or from a network. If rate limiting is not implemented, excessive API requests can overwhelm the server, causing long response times and abandoned requests.

Abandoned Requests: When a server is overwhelmed with too many requests, it may not process them all, leading to abandoned requests.

Long Response Times: Without rate limiting, the server might be handling more requests than it can efficiently process, resulting in delayed responses.

Solution: Implementing rate limiting ensures that the server processes requests at a manageable rate, improving performance and reliability.