PRN221 FE EXAM QUESTIONS AND CORRECT ANSWERS

PRN221 FE EXAM QUESTIONS AND CORRECT
ANSWERS

d - ANSWER Choose the correct statement about key components of
the System.Net.* Namespaces
a. HttpServer for consuming HTTP web APIs and RESTful services
b. WebRequest and WebResponse classes for high-level control over
client-side TCP or UDP operations
c. All of the others
*d. A WebClient facade class for simple download/upload operations via
HTTP or FTP*

b - ANSWER To configure a custom number of reconnect attempts
before disconnecting or change the reconnect timing, the with automatic
reconnect accepts an array of numbers representing the delay in
milliseconds to wait before starting each reconnects attempt. Choose the
correct option for making an automatic reconnect.
a. const connection = new signal.HubConnectionBuilder()
.withUrl("/chathub") .withAutomaticReconnect(0, 0, 10000) .create();

b. const connection = new signalR.HubConnectionBuilder()
.withUrl("/chathub") .withAutomaticReconnect([0, 0, 10000]) .build();

c. const connection = new signalR.HubConnectionBuilder()
.withUrl("/chathub") .withAutomaticReconnect([0], [0], [10000]) .build();

d. None of the others

c - ANSWER Choose the correct statement related to Networking
Definitions
a. Port: unsigned 4-byte integer helps operating system differentiating a
network communicating process
b. IP address includes IPv4 (4-byte) and IPv6 (6-byte)
*c. IP address (Internet Protocol): unsigned integer helps to identify a
network element(computer, router, etc)*
d. None of the others

,d - ANSWER Which of the following methods of the HttpClient Class can
be used to send a POST request to the specified Uri as an
asynchronous operation?
a. CreatePostAsync(String, HttpContent)
b. PostRequestAsync(String, HttpContent)
c. PutAsync(String, HttpContent)
*d. PostAsync(String, HttpContent)*

a - ANSWER Which of the following classes of the
System.Threading.Tasks Namespace provides support for creating and
scheduling Task objects?
*a. TaskFactor*
b. Task
c. TaskInit
d. None of the others
e. TaskScheduler

c - ANSWER In the case working ASP.NET SignalR with JavaScript
client library, which the following code to create and start a connection?
a. var connection = new signalR.ConnectionBuilder()
.withUrl("/chatHub") .build();
connection.start();

b. var connection = new
signalR.HubConnectionBuilder(.withUrl("/chatHub") .create();
connection.start();

c. var connection = new
signalR.HubConnectionBuilder().withUrl("/chatHub") .build();
connection.start();

d. var connection = new
signalR.HubBuilder() .withUrl("/chatHub") .build();
connection.start();

c - ANSWER A hub is a class that serves as a high-level pipeline that
handles client-server communication. Create a SignalR for your

,application by adding a class named ChatHub that inherits from
Microsoft.AspNetCore.SignalR.Hub

a. public class ChatHub : IHub {
public async Task SendMessage(string user, string message) {
await Clients.All.SendAsync("ReceiveMessage", user, message);
}}

b. public class Hub : ChatHub {
public async Task SendMessage(string user, string message) {
await Clients.All.SendAsync("ReceiveMessage", user, message);
}}

c. public class ChatHub : Hub {
public async Task SendMessage(string user, string message) {
await Clients.All.SendAsync("ReceiveMessage", user, message);
}


d. public class ChatHub : IHubContext {
public async Task SendMessage(string user, string message) {
await Clients.All.SendAsync("ReceiveMessage", user, message);
}}

d - ANSWER Choose the correct statement related to the HttpClient
Class
a. HttpClient was written in response to the growth of TCP-based web
APIs and TCP services to provide a better experience than the
WebClient class
b. None of the others
c. HttpClient is a newer API for working with TCP Service and is
designed to work well with libraries, REST-based services, and custom
authentication schemes
*d. HttpClient provides another layer on top of HttpWebRequest and
HttpWeb Response*

, a - ANSWER ASP.NET Core SignalR supports two protocols for
encoding messages. Each protocol has serialization configuration
options. Please choose the correct protocols.
*a. JSON and MessagePack*
b. BSON and MessagePack
c. JSON and BSON
d. JSON and XML

a - ANSWER Which of the following statements related to Worker
Service .NET is False?
Statement 1: A worker service is a .NET project built using a template
which supplies a few useful features that turn a regular console
application into something more powerful
**Statement 2**: A worker service runs on bottom of the concept of a
host, which maintains the lifetime of the application. The host also
makes available some familiar features, such as dependency injection,
logging, and configuration
*a. Statement 2*
b. Statement 1 and 2
c. Statement 1
d. None of the others

d - ANSWER Choose the correct option to create hub filters.
a. Create a filter by declaring a class that inherits from Hub<IFilter>, and
add the OnConnectedAsync method.
b. Create a filter by declaring a class that inherits from IFilter, and add
the InvokeMethodAsync method.
c. Create a filter by declaring a class that inherits from Hub<IHubFilter>,
and add the OnConnectedAsync method.
*d. Create a filter by declaring a class that inherits from IHubFilter, and
add the InvokeMethodAsync method.*
e. None of the others

a - ANSWER Which of the following properties of the HttpClient Class
can be used to get or set the base address of Uniform Resource
Identifier (URI) of the Internet resource used when sending requests?
*a. BaseAddress*
b. GetAddress