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ICND1 > Chapter 3 - TCP/IP > Flashcards

Chapter 3 - TCP/IP Flashcards

1
Q

What are the four layers to the DOD Model

A

Process/Application
Host to Host/Transportation
Internet
Network Access/Link Layer

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2
Q

In the DOD Model, what does the process/application layer include

A 
Telnet
FTP
LPD
SNMP
TFTO
SMTP
NFS
xWindow
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3
Q

In the DOD Model, what does the transportation layer include

A

TCP/UDP

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4
Q

In the DOD Model, what does the Internet layer include

A

IP

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5
Q

In the DOD Model, what does the network access layer include

A

Ethernet
Fast ethernet
tokken ring
fddi

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6
Q

What is telnet and what port does it use

A

Telnet is s terminal emulation protocol that essentially works like a virtual keyboard.
Everything is sent in clear text
Uses an 8 bit connection via UDP

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7
Q

What is SSH and what port does it use

A

Port 22

Much like telnet, it is used to issue commands to a remote computer, but everything is encrypted.

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8
Q

What is FTP and what port does it use

A

Used to transfer files between two machines.

Port 20 & 21

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9
Q

What is TFTP and what port does it use

A

Commonly used to boot via the network. Similar to FTP, but doesn’t allow directory browsing and sends much smaller blocks.
Port 69

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10
Q

What is SNMP and what port does it use

A

Used to collect and manipulate network info
A network management station periodically polls the devices on the network and can alert an admin of problems
Port 161 & 162

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11
Q

What is HTTP and what port does it use

A

Used to communicate between web browsers and servers

Port 80

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12
Q

What is HTTPS and what port does it use

A

Port 443

Secure version of HTTP; HTTP over SSL

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13
Q

What is NTP and what port does it use

A

Used to synchronize clocks on the network

Port 123

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14
Q

What is DNS and what port does it use

A

Used to resolve domain names to IP

Port 53

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15
Q

What is DHCP/BOOTP

A

Port 67 Server Port 68 Client
Assigns IP addresses to hosts on the LAN
BOOTP requires manually input of IP addresses
This uses UDP at layer 4

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16
Q

What is APIPA

A

Automatic Private IP Addressing is self configured to communicate without a DHCP server.
169.254.0.1 - 169.254.255.254

17
Q

What is a Class A IP address

A 
Network.Host.Host.Host
Range: 0-127
First bit in the network address must be zero
Max 126 networks (+1 for diagnostics)
Max 16,777, 216 nodes
Reserved 10.0.0.0-10.255.255.255
18
Q

What is a Class B IP address

A

Range: 128-192
Network.Network.Host.Host
First bit of the first two bytes has to be 1.
16384 possible networks (2^14, 14 of the 16 possible bits)
65534 possible nodes
RESERVED: 172.16.0.0 - 172.31.255.255

19
Q

What is a Class C IP address

A 
Network.Network.Netowrk.Host
Range 192- 223
First 2 bits of the first 3 bytes must be 1. 
2, 097, 152 possible networks
254 possible nodes
20
Q

What is a Class D ip address

A

Multicast address

Range 224-239

21
Q

What is a class E IP address

A

Experimental

240-255

22
Q

What is NAT

A

Used to translate an IP address to a public routable address.

23
Q

Outline what TCP is

A 
Breaks data into segments
Assigns sequence to segments
Retransmits lost segments
Connection oriented
Costly
24
Q

Outline the structure of a TCP header

A 
32 bit Sequence
32 Bit ACK
4 Bit Header length
? bit reserved
? bit flags
16 bit Window Size
16 bit checksum
16 bit urgent point
Options
Data
16 bit source port
16 bit destination port
25
Q

What is the window size in a tcp header

A

This is the size of the window the sender will accept

26
Q

What makes UDP different

A

Integrity checking is left up to the application layer.

27
Q

What is the structure of a UDP header

A 
16 bit source port
16 bit destination port
16 bit length
16 bit checksum
Data
28
Q

What are examples of a TCP application

A 
FTP
Telnet
POP3
DNS
SMTP
HTTP
HTTPS
SSH
IMAP
29
Q

What are examples of UDP Applications

A 
TFTP
BOOTP
DNS
SNMP
NTP
30
Q

What range do well-known ports fall into

A

1023-3232

31
Q

What is a software or logical address

A

IP address

32
Q

Outline the structure of a IP header

A

4 bit version | 4 bit header length | 8 bit priority | total length
Identification | flags | Fragmented offset
8 bit TTL | 8 bit protocol | 16 bit checksum
32 bit source IP
32 bit Destination IP
0-32 bit options
Data

33
Q

In an IP header, what is fragmentation offset

A

provides fragmentation & reassembly if the packet offset is to large to put into a frame

34
Q

What is ICMP

A 
Uses port 1.
Management protocol and messaging service provider for IP. Can give error messages. 
Common messages:
Destination unreachable
Buffer full
hops time
ping
traceRT
35
Q

What is the ARP cache

A

Address resolution protocol finds the hardware address that corresponds to the destination IP

ICND1 (3 decks)

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