Chapter 8: TCP/IP Applications Flashcards

1
Q

What is TCP designed for ?

A

Checking for errors

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2
Q

What are three other sessions that use UDP ?

A

NTP, SNTP, TFTP

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3
Q

Domain name system (DNS)

A

Use of names associated with IP addresses

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4
Q

What is DNS’s UDP port number ?

A

53 by default

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5
Q

Does DHCP send information for each step without any confirmation ?

A

Yes

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6
Q

NTP/SNTP

A

Synchronize the clocks of devices on a network. Operates in hierarchical fashion

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7
Q

What is the UDP port number for NTP/SNTP ?

A

123

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8
Q

Stratum servers

A

Start with stratum 0 (near perfect time) through stratum 15 (devices are not synced with the clock)

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9
Q

What other connections does NTP/SNTP employ ? Why ?

A

Peer-to-peer connections for backups and sanity checks

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10
Q

Trivial file transfer protocol (TFTP)

A

Transfer files with no data protection

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11
Q

Typical TFTP usage ?

A

Update software and configuration on devices on a LAN (routers, switches, VoIP)

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12
Q

UDP port number for TFTP ?

A

69

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13
Q

Can an single session consist of a series of packets ?

A

Yes

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14
Q

Firewall

A

Filters all packets between two computers

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15
Q

Ping destination host unreachable ?

A

No route to address listed or router can’t go forward

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16
Q

Ping request timed out ?

A

Slow network, excess traffic, downed router, etc.

17
Q

Can ping responses be disabled on a target computer ?

A

Yes

18
Q

Internet group management protocol (IGMP)

A

Enables routers to communicate with hosts and switches to determine a “group” membership

19
Q

Well-known ports

A

0 to 1023 reserved for TCP/IP applications

20
Q

Dynamic/ephemeral/private ports

A

Web client generates a pseduo-randomly source port number, which is used as a destination port for receiving

21
Q

Ephemeral port number range ?

A

49152-65535

22
Q

Registered ports

A

Available for anyone to use
1024-49151

23
Q

Socket/endpoint

A

Session information (IP address, port number, layer 4 protocol) held in memory on a single computer

24
Q

Socket pairs/endpoints

A

Two computers holding session information in their memory

25
Q

Session

A

Whole interconnection

26
Q

Netstat

A

Utility that lists the endpoints of the computers communication