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Flashcards in CompTIA Network+ Deck (31):
0

What is a port?

Ports are what an application uses when communicating between a client and server computer.

1

What port type and number is used by FTP?

TCP.
20 and 21

2

What port type and number is used by SSH?

TCP
22

3

What port type and number is used by TELNET?

TCP
23

4

What port type and number is used by SMTP?

TCP
25

5

What port type and number is used by DNS?

TCP/UDP
53

6

What port type and number is used by DHCP?

UDP
67

7

What port type and number is used by TFTP?

UDP
69

8

What port type and number is used by HTTP?

TCP
80

9

What port type and number is used by POP3?

TCP
110

10

What port type and number is used by NTP?

TCP
123

11

What port type and number is used by IMAP4?

TCP
143

12

What port type and number is used by SNMP?

UDP
161

13

What port type and number is used by HTTPS?

TCP
443

14

What 2 parts can every IP address be broken down into?

Network ID (netid) and the Host ID (hostid). All hosts on the same network must have the same netid. Each of these hosts must have a hostid that is unique in relation to the netid.

15

What are IP addresses divided into?

4 octets each having a maximum value of 255. We view IP addresses in decimal notation but it is actually utilized as binary data.

16

How many classes are IP addresses divided into?

3. A (1-126), B (128-191), C (192-223). Only for IPv4. This scheme has run out of available IP addresses. This lead to IPv6.

17

What is IPv6?

IP addressing scheme that uses a 128 bit address (instead of 32 with IPv4) and utilizes a hex numbering method in order to log long addresses (IPv4 used binary)

18

What is a MAC address?

Known as a hardware address or Ethernet address. It is a unique code assigned to most networking hardware. The hardware is assigned a unique number by the manufacturer and the address is permanently assigned to that device. 48 bit hexidecimal format.

19

Describe class A IP addresses.

Class A addresses are for networks with a large number of hosts. The first octet is the netid and the 3 remaining octets are the hostid.

20

Describe class B IP addresses.

Class B addresses are used in medium to large networks with the first 2 octets making up netid and the remaining 2 are hostid.

21

Describe class C IP addresses.

Class C is for smaller networks with the first 3 octets making up the netid and the last octet comprising the hostid.

22

What is the default subnet mask for class A?

Default Subnet - 255.0.0.0
Subnets - 126
Hosts per subnet - 16,777,214

23

What is the default subnet mask for class B?

Default subnet- 255.255.0.0
Subnets - 16,384
Hosts per subnet - 65,534

24

What is the default subnet mask for class C?

Default subnet - 255.255.255.0
Subnets - 2,097,152
Hosts per subnet - 254

25

What if you wanted more than 1 subnet?

You can create multiple logical networks that exist within a single class a, b, or c network. If you down subnet you will only be able to use one network. When submitting is employed the multiple networks are connected with a router that enables data to find its way between networks.

26

What is classless addressing?

Classes inter domain routing (CIDR) is done by allocating address space to internet service providers and end users on any address bit boundary, instead of 8 bit segments.

27

What is NAT?

Network address translation. Commonly used IP translation and mapping technology. Using a router or piece of software that implements NAT allows and entire home or office network to share a single internet connection over a single IP address.

28

What is PAT?

Ports address translation. A feature of a network device that translates TCP or UDP communications made between hosts on a private network and hosts on a public network. It allows a single public IP address to be used by many hosts on a private network.

29

What is SNAT?

Secure network address translation. An extension of standard NAT service. Done through one to one IP address translation of one internal IP address to one external IP address where NAT is effectively one external address to many internal IP addresses.

30

What is DHCP?

Dynamic host configuration protocol. Provides a solution that automatically assigns IP addresses to computers on a network. Prevents users from making up their own IP addresses