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Network+ chapter 1 > General > Flashcards

General Flashcards

1
Q

TCP Flags

A

Layer 4 (bits with the header that can control the data flow)

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2
Q

Maximum size of an internet packet

A

1500 bytes (IP header 20, TCP header 20, TCP data 1460)

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3
Q

peer to peer

A

all devices communicate to each other(both clients and server)

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4
Q

client server

A

clients talk to server

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5
Q

NAS vs SAN

A

network attached storage (cant change a single byte) Storage area network (can make single byte changes)

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6
Q

demarcation point

A

point where the outside network connects to your personal network

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7
Q

hypervisor

A

virtual machine manager (manages the OS, CPU, networking and security

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8
Q

fiber

A

more expensive than copper, but faster over long distance

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8
Q

Satellite networking

A

non terrestrial, high cost, 50 Mbit/s down 3 Mbit/s up, 250 ms up and down latency, 2 GHz frequency

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9
Q

media converter

A

Layer 1, extends distance, converts from fiber to copper or other way

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10
Q

transceiver

A

transmitter and receiver

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11
Q

duplex communications

A

transmit and receive

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12
Q

BiDi

A

bi directional transceiver(you can transmit and receive on 1 fiber)

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13
Q

Half vs Full duplex

A

half lets you send or receive, full lets you do both

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14
Q

loop back addresses

A

127.0.0.1-127.255.255.254

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15
Q

reserved addresses

A

240.0.0.1-254.255.255.254

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16
Q

how many bits and bytes in IPv4

A

32 bits or 4 bytes

17
Q

APIPA addresses

A

169.254.0.1-169.254.255.254

18
Q

private IP addresses

A

10.0.0.0-10.255.255.255
172.16.0.0-172.31.255.255
192.168.0.0-192.168.255.255

19
Q

uni cast

A

one device sending communication to another device

20
Q

broadcast

A

sends information to everyone at once (usually only to subnet)

21
Q

multicast

A

delivers only to devices that are interested in that data

22
Q

anycast

A

a single destination that has many options or endpoints

23
Q

classes of subnets (leading bits)

A

A- 1-127
B-128-191
C-192-223
D-(multicast)224-239
E-(reserved)240-254

24
Q

calculate number of subnets

A

take class of subnet and if a higher Cider is used the reminder are the subnet bits EX: 10.0.0.0/24 (subnet bts 16)

number of subnets=2^subnet bits

25
Q

calculate hosts per subnet

A

2^host bits-2

26
Q

how many bits and bytes in IPv6

A

128 bits or 16 bytes (2 bytes per section)

27
Q

ways to compress IPv6

A

:: removes grouped 0’s
leading 0’s are removed

28
Q

EUI-64

A

extended unique identifier (64-bit)(convert MAC address to this for IPv6

29
Q

Flipping the 7th bit for making IPv6 address

A

convert second character to the one up or down in group, then add FFFE in middle

0 1
2 3

4 5
6 7

8 9
A B

C D
E F

30
Q

Break down a IPv6 address

A

first 48 bits are provided by IANA/RIR/ISP (global routing prefix),next 16 are local assigned subnet group, rest of 64 bits is the host ID

31
Q

teredo/miredo

A

teredo tunnels IPv6 through IPv4 on windows
miredo is for linus and mac

32
Q

dual stack routing

A

forward traffic through IPv4 and IPv6 at the same time

33
Q

since IPv6 doesnt have broadcast, what does it use?

A

NS or neighbor solicitation sent as multicast

34
Q

DHCP relay

A

configure a router to this, it transfers the message to a DHCP server

35
Q

DHCP renewal (T1 and T2 timer)

A

T1-50% of lease time
T2-87.5% of lease time

36
Q

How many root DNS servers are there?

A

13 with 1000 actual redundant servers

37
Q

recursive vs iterative query

A

recursive delegates the lookup to a DNS server
iterative requires you to do all the queries yourself

38
Q

forward vs reverse lookup

A

forward- give DNS server a FQDN and gets an IP address
Reverse- Give IP address and get a FQDN

39
Q
A

Network+ chapter 1 (9 decks)

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