CompTIA CompTIA Certifications JK0-023 Questions & Answers

• Question 221:

  No link lights on a switchns SFP are functoningf so the network technician re-terminates the end. Afer testng the cablef the tester is showing a db loss of -9. Which of the following types of cable is MOST likely being tested?

  A. Fiber

  B. CAT3

  C. CAT5e

  D. CAT6a

  Correct Answer: A

• Question 222:

  Several users from the same building are reportng connectvity issues. The SFP at that buildingns IDF switch is showing a link lightf but there is no link light to the corresponding switchns SFP at the MDF. Which of the following is the MOST likely cause?

  A. A crossover cable is being used.

  B. DB loss is too high on all strands.

  C. Only TX or RX strand is working.

  D. TX and RX are reversed.

  Correct Answer: C

• Question 223:

  A technician notces that network access is becoming increasingly slow. All of the actvity lightsf on the only network layer 2 switchf are blinking at steadily increasing rates. Which of the following is the MOST likely cause of the increased trafc?

  A. STP blocking

  B. Duplicate IP addresses

  C. MTU mismatch

  D. Switching loop

  Correct Answer: D

• Question 224:

  Which of the following BEST describes the diference between layer 2 switching and layer 2 routng?

  A. Switching moves packets between hosts on diferent subnetsf and routng moves packets between hosts on the same subnet.

  B. Routng moves packets between hosts on diferent subnetsf and switching moves packets between hosts on the same subnet.

  C. Both routng and switching move packets between hosts on the same subnetf but routng does so at a faster pace.

  D. Both routng and switching move packets between hosts on diferent subnetsf but switching does so at a faster pace.

  Correct Answer: B

• Question 225:

  Which of the following could be used to estmate RTT across a router?

  A. dig

  B. traceroute

  C. arp

  D. uptme

  Correct Answer: B

• Question 226:

  169.254.0.100 is an IP address which would MOST likely come from which of the following?

  A. CIDR

  B. DHCP

  C. APIPA

  D. DNS

  Correct Answer: C

• Question 227:

  Which of the following will prevent switching loops by selectvely shutng down switch ports?

  A. RIP

  B. IGP

  C. STP

  D. VLAN

  Correct Answer: C

• Question 228:

  Which of the following DNS records allows for reverse lookup of a domain?

  A. PTR

  B. AAAA

  C. A

  D. MX

  Correct Answer: A

• Question 229:

  Which of the following problems is MOST likely to arise when confguring an IPv6 over IPv4 tunnel?

  A. Routng loop

  B. MTU black hole

  C. Framing errors

  D. SYN food

  Correct Answer: B

• Question 230:

  Which of the following layers of the OSI model is between the Data Link and Transport layers?

  A. Applicaton

  B. Session

  C. Network

  D. Physical

  Correct Answer: C