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CompTIA Network+ N10-009 Questions And Answers.

How many host IP addresses will a /30 subnet mask give you? - Answer -2

How many IP addresses will a /23 subnet mask give you? - Answer -512 total (510
usable for hosts)

What is the CIDR notation for subnet mask 255.255.254.0? - Answer -/23

What is the CIDR notation for subnet mask 255.255.255.252? - Answer -/30

When does a MAC address change along a path? - Answer -with every hop

When would an IP address change along a path? - Answer -only if sent through a NAT

What is the port for HTTP? - Answer -80

What is the port for HTTPS? - Answer -443

What is the port for TFTP? - Answer -69

What is the port for SMTP? - Answer -23

What is the port for SSH? - Answer -22

What is the port for telnet? - Answer -25

What is the port for DNS? - Answer -53

What is the port for DHCP? - Answer -67, 68

What is the port for SNMP? - Answer -161, 162

What is the port for Syslog? - Answer -514

What is the port for FTP? - Answer -20, 21

What can a Wireless Access Point use to force the user to first authenticate before their
device can send traffic on the network? - Answer -802.1x

In 2.4 GHz spread spectrum Wi-Fi, which three channels do not overlap? - Answer -1,
6, 11

In the routing table, if a destination has multiple routes to it, what is the first criterion a
router will use to choose a route? - Answer -longest prefix match

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