Self-Check 3-5

What protocol does ping use?

a. FTP

b. DHCP

c. HTTP

d. ICMP

 Which command disables a computer's connection to the network?

a. sudo ip link set eth0 up

b. ipconfig /release

c. ping localhost

d. sudo hostname testVM

What problem will ping google.com check for that ping 8.8.8.8 will not?

a. DHCP scope exhaustion

b. Name resolution issues

c. Default gateway configuration

d. Incorrect DNS server

Self-Check 3-4

When your computer requests a DNS lookup, which DNS server holds the most reliable information for that DNS record?

a. Forwarding DNS server

b. Caching DNS server

c. Root DNS server

d. Primary DNS server

 Which DNS record type is listed first in a zone file?

a. SOA

b. AAAA

c. CNAME

d. A

Which DNS record type is used to find an FQDN from a given IP address?

a. PTR

b. CNAME

c. A

d. MX

Self-Check 3-3

When hosting a secure email server for access from the Internet, which port should be open on the corporate firewall?

a. 25

b. 110

c. 587

d. 443

 Which port should be open so you can remote into the corporate office's Linux Server from a branch office?

a. 1433

b. 23

c. 22

d. 3389

Self-Check 3-2

What command shows you a computer's TCP/IP configuration?

a. ssh

b. ping

c. ipconfig

d. nmap

 Which of the following IPv4 addresses is a public IP address?

a. 10.0.2.14

b. 64.233.177.189

c. 172.16.156.254

d. 192.168.72.73

Which IPv6 prefix can be routed on the Internet?

a. FC00::/7

b. FE80::/10

c. 2000::/3

d. ::1/128

Self-Check 3-1

What numbering system do humans use to write MAC addresses?

a. Binary

b. Hexadecimal

c. Base-2

d. Decimal

 

What Windows command outputs a computer's MAC address?

a. ipconfig

b. ping

c. ipconfig /all

d. oui-lookup