CompTIA CompTIA Certifications LX0-104 Questions & Answers

• Question 31:

  Instead of using specific host names or IP addresses, which string can be used in /etc/hosts.allow entries to cover any remote host no matter of its name or address? (Specify the relevant string only without any additional options or arguments.)

  A. all

  Correct Answer: A

• Question 32:

  Given the following line from /etc/nsswitch.conf:

  hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4

  By default, which file will be queried first for hostname lookups? (Specify the full name of the file, including path.)

  A. /etc/hosts

  Correct Answer: A

• Question 33:

  Depending on the host's configuration, which of the following files can be used to turn on and off network services running on a host? (Choose two.)

  A. /etc/profile

  B. /etc/services

  C. /etc/inetd.conf

  D. /etc/xinetd.conf

  E. /etc/host.conf

  Correct Answer: CD

• Question 34:

  How many bits make up an IPv6 address?

  A. 32

  B. 48

  C. 64

  D. 128

  E. 256

  Correct Answer: D

• Question 35:

  What is the assigned port number for the HTTP service? (Specify the port number using digits.)

  A. 80

  Correct Answer: A

• Question 36:

  Which command is used to manually assign an IP address to a network interface? (Specify only the command without any path or parameters.)

  A. ifconfig

  Correct Answer: A

• Question 37:

  Which of the following commands can be used to associate open TCP ports with the processes that opened the ports?

  A. ptrace

  B. strace

  C. debug

  D. nessus

  E. lsof

  Correct Answer: D

• Question 38:

  In order to discover the link layer address of the device that owns a specific IPv4 or IPv6 address, which mechanism is used?

  A. Both IPv4 and IPv6 use ARP.

  B. Both IPv4 and IPv6 use Neighbor Discovery.

  C. IPv4 uses ARP while IPv6 uses Neighbor Discovery.

  D. IPv4 uses Neighbor Discovery while IPv6 uses ARP.

  E. Both IPv4 and IPv6 can use either ARP or Neighbor Discovery depending on the network.

  Correct Answer: C

• Question 39:

  What is the purpose of the dig command?

  A. It can be used as a tool for querying DNS servers.

  B. It can be used for searching through indexed file content.

  C. It can be used to look for open ports on a system.

  D. It can be used to ping all known hosts on the current subnet.

  Correct Answer: A

• Question 40:

  How does the ping command work by default?

  A. It sends a UDP packet to port 0 of the remote host and waits to receive a UDP error response in return.

  B. It sends an ARP request to a remote host and waits to receive an ARP response in return.

  C. It sends a TCP SYN packet to a remote host and waits to receive an TCP ACK response in return.

  D. It sends a broadcast packet to all hosts on the net and waits to receive, among others, a response from the target system.

  E. It sends an ICMP Echo Request to a remote host and waits to receive an ICMP Echo Response in return.

  Correct Answer: E