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IPV4 Addressing

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
2
LIRs
Internet Control Message Protocol
IANA

2. What is the IPv4 Protocol number for IGMP?
Padding of zeros to ensure that the header ends on a 32-bit boundary
4
Router(config-if)#no ip proxy-arp
2

3. Who can assign IP address space to end user organizations?
RFC 791
DSCP (6-bit); ECN (2-bit)
All Internet Registries
Transmission Control Protocol

4. What is RST?
Internet Control Message Protocol
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
169.254.0.0/16
Reset

5. What is the content of the the Urgent Pointer field in the TCP header?
Acknowledgement
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Router(config-if)#no ip proxy-arp
Router Advertisement

6. What is the function of ICMP redirect messages?
NIRs
Reserved (1-bit); DF (1-bit); MF (1-bit)
Router(config-if)#no ip proxy-arp
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

7. What is ICANN?
Internet Corporation for Assigned Network Numbers
Final
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
46

8. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
6
Router#show arp
17
Router(config-if)#arp timeout {seconds}

9. What is the ARP Protocol address length value for IPv4?
4
Router Selection
Internet
127.0.0.0/8

10. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Per-Hop Behaviour (PHB)
Router Advertisement
Host-to-host
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

11. What is LIR?
6
Version (4-bit); Header Length (4-bit); ToS (8-bit); Total Length (16-bit); Identifier (16-bit); Flags (3-bit); Fragment Offset (13-bit); TTL (8-bit); Protocol (8-bit); Header Checksum (16-bit); Source Address (32-bit); Destination Address (32-bit);
Router#debug arp
Local Internet Registry

12. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Echo
2
Internet
Protocols that include subnet masks in their routing updates

13. What is the recommended default TTL?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
More Fragments follow
Padding of zeros to ensure that the header ends on a 32-bit boundary
64

14. What is IRDP?
ICMP Router Discovery Protocol
Windowing
Identifier; Flags and Fragmentation Offset
Maximum Segment Size (MSS)

15. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
IANA
255.255.255.128
Open Systems Interconnection
255.255.255.248

16. What is CWR?
47
Congestion Window Reduced
Echo
Network interface

17. What is the format of an ICMP header?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Protocols that don't include subnet masks in their routing updates
IPv4 and IPv6
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

18. What is the IPv4 Protocol number for OSPF?
Router Advertisement
89
8
National Internet Registry

19. What mechanism is used by TCP to regulate the flow of segments?
Local Internet Registry
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Windowing
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

20. What is ICMP Type 9?
Windowing
Router Advertisement
89
0x0800

21. What is RIR?
Regional Internet Registry
Router#show arp
88
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

22. Who are LIRs?
Internet Control Message Protocol
Echo Reply
Mostly large ISPs - enterprises - or academic institutions
DHCP

23. What routing protocols are classful?
RIPv1 and IGRP
1
The next sequence number that the source expects to receive from the destination
ICANN and IANA

24. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Host-to-host
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Each router decrements the TTL

25. What is ARP?
Synchronize
Router Advertisement
Address Resolution Protocol
Used by IRDP on some operating systems to discover local routers

26. What are the protocol categories that describe the physical layer?
Subtract Header Length field from Total Length field
Source Port (16-bit); Destination Port (16-bit); Sequence Number (32-bit); Acknowledgement Number (32-bit); Header Length (4-bit); Reserved (4-bit); Flags (8-bit); Windows Size (16-bit); Checksum (16-bit); Urgent Pointer (16-bit); Options; Padding
National Internet Registry
Electrical/Optical - Mechanical - Functional and Procedural

27. What is the first octet rule for IPv4 address classes in binary?
RIRs
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Router(config-if)#arp timeout {seconds}
20 octets

28. Which RFC defines IPv4?
Internet
Windowing
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
RFC 791

29. What is the ARP Operation value for an Inverse ARP Request?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
8
0x0800
RIRs

30. What is Reverse ARP?
Internet Protocol
Padding of zeros to ensure that the header ends on a 32-bit boundary
Data Offset
Used by a host to obtain the IPv4 address associated with its own MAC address

31. What is the other name for the TCP Header Length field?
They are the same byte - but the names and value interpretations are different
Used by a host to obtain the IPv4 address associated with its own MAC address
Data Offset
Urgent

32. What is the ARP Operation value for an Inverse ARP Reply?
4
Per-Hop Behaviour (PHB)
Protocols that don't include subnet masks in their routing updates
9

33. What is ISP?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
IANA
Internet Corporation for Assigned Network Numbers
Internet Service Provider

34. What is the IPv4 Protocol number for GRE?
Reset
URG flag set
47
Sequence Number

35. What is PSH?
RIRs
RFC 1918
Push
0

36. What is the IPv4 Protocol number for ICMP?
Router(config)#arp {ip-address} {mac-address} arpa
1
Electrical/Optical - Mechanical - Functional and Procedural
Length of header in words (32-bit)

37. What is prefix /30 in decimal notation?
1
255.255.255.252
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Echo Reply

38. What are the private IPv4 address ranges?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Router Advertisement
Don't Fragment
Router#clear arp-cache [{interface {interface}} | {ip-address}]

39. What is Inverse ARP?

40. What is the format of the TCP Header Length field?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
The next sequence number that the source expects to receive from the destination
Length of header in words (32-bit)
Version (4-bit); Header Length (4-bit); ToS (8-bit); Total Length (16-bit); Identifier (16-bit); Flags (3-bit); Fragment Offset (13-bit); TTL (8-bit); Protocol (8-bit); Header Checksum (16-bit); Source Address (32-bit); Destination Address (32-bit);

41. What is the IPv4 protocol number for UDP?
Congestion Window Reduced
17
Acknowledgements - checksums and timers
RFC 3330

42. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
192.0.2.0/24
Congestion Window Reduced
Sequence Number
LIRs

43. What is the prerequisite for using the Urgent Pointer field in the TCP header?
URG flag set
Socket
Reserved (1-bit); DF (1-bit); MF (1-bit)
Uniquely identify every application in the network

44. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Sequence Number + Data payload octets + 1
RFC 3330
Host-to-host
Final

45. What is the maximum length of an IPv4 header?
Urgent
Acknowledgements - checksums and timers
Address Resolution Protocol
60 octets

46. What is ICMP Type 3?
Length of header in words (32-bit)
Destination Unreachable
DSCP (6-bit); ECN (2-bit)
169.254.0.0/16

47. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Sequence Numbers
Subtract Header Length field from Total Length field
Version (4-bit); Header Length (4-bit); ToS (8-bit); Total Length (16-bit); Identifier (16-bit); Flags (3-bit); Fragment Offset (13-bit); TTL (8-bit); Protocol (8-bit); Header Checksum (16-bit); Source Address (32-bit); Destination Address (32-bit);
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

48. What is ICMP Type 0?
Echo Reply
Protocols that include subnet masks in their routing updates
Acknowledgements - checksums and timers
All Internet Registries

49. What is the most commonly used Option field in the TCP header?
255.255.255.248
Router Selection
RIPv1 and IGRP
Maximum Segment Size (MSS)

50. What are the steps to subnet an IPv4 address?
1
1 Determine how many subnets are required; 2 Determine how many hosts per subnet are required; 3 Determine the subnet mask for each subnet; 4 Calculate the network address for each subnet
Redirect
Internet Assigned Numbers Authority