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2021 Dec JK0-019 exam question

Q251. Several users are sending emails to CompTIA.org. but they are not being received. Which of the following commands could be used to verify that the company is able to connect to the mail service at CompTIA.org? 

A. Ping 

B. Arp 

C. Dig 

D. telnet 

Answer: D 


Q252. Sandy, an administrator, attempts to open a web page and sees the following error 'Error 404: Page not found'. She then uses the ping command and finds that the default gateway cannot be pinged. At which of the following layers does the problem MOST likely reside? 

A. Layer 1 

B. Layer 4 

C. Layer 5 

D. Layer 7 

Answer: A 


Q253. Which of the following wireless technologies can support the GREATEST distance on either 2.4GHz or 5GHz frequencies? 

A. 802.11a 

B. 802.11b 

C. 802.11g 

D. 802.11n 

Answer: D 


Q254. Which of the following is a form of encrypting packets for safe, secure data transmission within a network? 

A. RAS 

B. PPTP 

C. IPSec 

D. ICA 

Answer: C 


Q255. Which of the following DNS record types provides the hostname to IP address mapping? 

A. A record 

B. NS record 

C. CNAME record 

D. MX record 

Answer: A 


Far out JK0-019 exam question:

Q256. A user receives an email slating that their account was compromised and there is a need to verify account credentials by submitting the correct information on a website. Which of the following security threats is occurring? 

A. Phishing 

B. Smurf attack 

C. Denial of service 

D. Man-in-the-middle 

Answer: A 


Q257. The network administrator has just finished installing a new 10/100/1000 switch, but receives reports from the server administrator that servers connected to the new switch seem to be experiencing slow LAN connections. The network administrator checks the port connecting the new switch to the core switch and sees the following information: 

#show run interface GigabitEthernet0/10 

Switchport trunk encapsulation dot1q 

Switchport mode trunk 

Switchport trunk native VLAN 10 

Which of the following is the MOST likely cause of the slow connections? 

A. The servers have not had VLAN tagging enabled on their NICs. 

B. Speed and duplex have not been set. 

C. VLAN tagging was not set on the trunk. 

D. The servers have been connected with CAT5 cable. 

Answer: B 


Q258. Switch A is configured with VLAN 105 and 106. Switch B is configured with VLAN 105 and 107. Both switches are connected with a fiber cable. In order for packets from all VLANs to cross the fiber cable, which of the following configurations MUST be present? 

A. Reverse ARP 

B. Full duplex on the fiber link 

C. PoE 

D. 802.1q trunking 

Answer: D 


Q259. Users report that there Internet connection is slow. The network technician has a suspicion that users are streaming video and music. Which of the following would BEST confirm the technician's theory? 

A. Traffic analysis 

B. SNMP 

C. History logs 

D. System logs 

Answer: A 


Q260. Which of the following is an invalid subnet mask? 

A. 255.0.0.0 

B. 255.256.255.0 

C. 255.255.255.255 

D. 255.255.00 

Answer: B