Free JK0-019: CompTIA Network+ Certification Exam Questions and Answers
232 verified practice questions for JK0-019.
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Last updated: September 19, 2026
- Exam code
- JK0-019
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- CompTIA
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Question #1
Several users from the finance department report that they are able to access the Internet, but unable to connect to their financial applications. The network technician is unable to ping the finance server. The technician decides to check the switch and determines that Internet access is working. Which of the following is a possible cause of the access issues?
Please select an optionIncorrectCorrect answer: C
Finance Server is placed in same VLAN which is assigned to finance users if they are able to access internet that’s means connectivity to switch is good, so we have to check the VLAN assigned to users.
Was this answer correct?Question #2
A technician needs to ensure that traffic from a specific department is separated within several switches. Which of the following needs to be configured on the switch to separate the traffic?
Please select an optionIncorrectCorrect answer: C
A VLAN is a group of end stations with a common set of requirements, independent of physical location. VLANs have the same attributes as a physical LAN but allow you to group end stations even if they are not located physically on the same LAN segment.
Was this answer correct?Question #3
Given a subnet mask of 255.255.255.0, how many usable IP addresses would be in that subnet?
Please select an optionIncorrectCorrect answer: B
The Subnet Mask however, determines the "class" of a Network. 255.255.255.0 is a "Class C" network.A class c network can host up to 254 pc's
Was this answer correct?Question #4
Which of the following TCP/IP model layers does the OSI model Presentation layer map to?
Please select an optionIncorrectCorrect answer: C
The Application layer provides applications the ability to access the services of the other layers and defines the protocols that applications use to exchange data. There are many Application layer protocols and new protocols are always being developed.
Was this answer correct?Question #5
Which of the following LAN technologies is used to provide a MAXIMUM bandwidth of 1Gbps through singlemode fiber?
Please select an optionIncorrectCorrect answer: D
1000BaseX identifies various Gigabit Ethernet physical layer standards as defined in IEEE802.3z, such as 1000BaseLX, 1000BaseSX, 1000BaseCX and 1000BaseLH. Basically, all standards included in 1000BaseX uses 8B/10B coding scheme with 8 bits of data and 2 bits of error- correction data. Each specification allows various cable (fiber or copper) lengths, and uses different cable media.
Was this answer correct?Question #6
Users are reporting that some Internet websites are not accessible anymore. Which of the following will allow the network administrator to quickly isolate the remote router that is causing the network communication issue, so that the problem can be reported to the appropriate responsible party?
Please select an optionIncorrectCorrect answer: C
Tracet command will tell the administrator which route is not present or which is present so he will come to know whether he has appropriate route or not.
Was this answer correct?Question #7
Which of the following network protocols is used to resolve FQDNs to IP addresses?
Please select an optionIncorrectCorrect answer: A
An Internet service that translates domain names into IP addresses. Because domain names are alphabetic, they're easier to remember. The Internet however, is really based on IP addresses. Every time you use a domain name, therefore, a DNS service must translate the name into the corresponding IP address. For example, the domain name www.example.com might translate to 198.105.232.4.
Was this answer correct?Question #8
Which of the following network protocols is used to transport email between servers?
Please select an optionIncorrectCorrect answer: D
While electronic mail servers and other mail transfer agents use SMTP to send and receive mail messages, user-level client mail applications typically use SMTP only for sending messages to a mail server for relaying
Was this answer correct?Question #9
An employee connects to a work computer from home via the built-in Windows remote desktop connection. Which of the following is MOST likely being used to establish the connection?
Please select an optionIncorrectCorrect answer: A
Remote Desktop Protocol (RDP) is a proprietary protocol developed by Microsoft, which provides a user with a graphical interface to connect to another computer over a network connection. The user employs RDP client software for this purpose, while the other computer must run RDP server software.
Was this answer correct?Question #10
Which of the following TCP ports are used by FTP? (Select TWO).
Select 2 answers.
Please select an optionIncorrectCorrect answer: A, B
FTP uses two ports by default: 21 for sending commands, and 20 for sending data. For instance if you said "FTP <ServerName>" it would make the attempt using port 21. If the session was established, port 20 would be using for the data. NotE. These are the default ports which is what I assume you were asking. A server administrator can however configure FTP to use whatever port he defines.
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