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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. What is the ARP Protocol address length value for IPv4?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
4
IPv4 and IPv6
Identifier; Flags and Fragmentation Offset

2. What is the format of the Flags field in the IPv4 header?
IANA
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Reserved (1-bit); DF (1-bit); MF (1-bit)
Both the TCP header and the encapsulated data

3. What mechanisms are used by TCP to provide reliable segment delivery?
Acknowledgements - checksums and timers
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
Router Selection
4

4. What is the prerequisite for using the Urgent Pointer field in the TCP header?
URG flag set
An ARP request issued by a host with its own IPv4 address as the target address
Final
ICANN and IANA

5. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
198.18.0.0/15
Acknowledgements - checksums and timers
1
46

6. What is ICMP Type 8?
IANA
Echo
0x0800
Application

7. What is prefix /30 in decimal notation?
Router(config)#ip arp proxy disable
Windowing
255.255.255.252
Urgent

8. What is the content of the TCP Window Size field?
Number of octets - starting with the octet indicated by the Acknowledgement Number - that the receiver will accept from the sender before the sender must stop transmitting and wait for a new Acknowledgement
198.18.0.0/15
255.255.255.252
Internet Protocol

9. Who allocates IP address space and AS numbers to RIRs?
IANA
The next sequence number that the source expects to receive from the destination
Protocols that don't include subnet masks in their routing updates
Router Advertisement

10. What is the purpose of a socket?
Uniquely identify every application in the network
Router#debug arp
DSCP (6-bit); ECN (2-bit)
2

11. What is the first octet rule for IPv4 address classes in binary?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
255.255.255.224
3
46

12. What is ICMP Type 9?
Router Advertisement
Final
RFC 3330
Sequence Number

13. Which RFC defines the special use IPv4 address ranges?
0x0800
255.255.255.128
RFC 3330
Network interface

14. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Internet Control Message Protocol
0.0.0.0/8
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Internet

15. What are classful routing protocols?

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16. What IPv4 header fields are used for fragmentation?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Length of header in words (32-bit)
0
Identifier; Flags and Fragmentation Offset

17. What is the most commonly used Option field in the TCP header?
2
Maximum Segment Size (MSS)
127.0.0.0/8
Time Exceeded

18. What is the ARP Protocol type value for IPv4?
0x0800
192.88.99.0/24
Both the TCP header and the encapsulated data
Router(config-if)#no ip proxy-arp

19. Displays the ARP cache of a router
Time to Live
Address Resolution Protocol
IANA
Router#show arp

20. What are the IP Precedence values?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Padding of zeros to ensure that the header ends on a 32-bit boundary

21. What is the format of a UDP header?
Time to Live
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Don't Fragment
Synchronize

22. What is the format of the DiffServ byte?
9
255.255.255.224
DSCP (6-bit); ECN (2-bit)
Echo Reply

23. Which IPv4 address range is reserved for loopback testing?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
127.0.0.0/8
89

24. What is proxy ARP?
IANA
0.0.0.0/8
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
255.255.255.240

25. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
Internet Assigned Numbers Authority
Subtract Header Length field from Total Length field
Internet
Sequence Number

26. Deletes dynamic entries from the ARP cache
Urgent
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Uniquely identify every application in the network
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

27. Which RFC defines the private IPv4 address ranges?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
RFC 1918
89
Identifier; Flags and Fragmentation Offset

28. What is the format of a TCP header?
Router(config)#ip arp proxy disable
6
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
Padding of zeros to ensure that the header ends on a 32-bit boundary

29. What is the format of the ToS field?
Router(config)#ip arp proxy disable
RFC 3330
Maximum Segment Size (MSS)
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

30. What is the name of the queuing and forwarding of IP packets based on DiffServ?
RFC 1918
1
Network interface
Per-Hop Behaviour (PHB)

31. What is prefix /28 in decimal notation?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Time to Live
Sequence Numbers
255.255.255.240

32. What mechanism is used by TCP to provided ordered segment delivery?
Internet
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);
Sequence Numbers
192.0.2.0/24

33. What is the content of the the Urgent Pointer field in the TCP header?
Application
255.255.255.224
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
88

34. What is RIR?
192.0.2.0/24
Length of header in words (32-bit)
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
Regional Internet Registry

35. What is Inverse ARP?

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36. What is CWR?
Subtract Header Length field from Total Length field
255.255.255.224
169.254.0.0/16
Congestion Window Reduced

37. Why must the header checksum of an IPv4 packet be recalculated at every router?
8
Each router decrements the TTL
Internet Control Message Protocol
RFC 1918

38. What is the IPv4 Protocol number for GRE?
47
Identifier; Flags and Fragmentation Offset
Socket
46

39. What is PSH?
Protocols that include subnet masks in their routing updates
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Push
RFC 791

40. What is ARP?
Address Resolution Protocol
Time to Live
198.18.0.0/15
Used by a host to obtain the IPv4 address associated with its own MAC address

41. What is the format of an IPv4 header?
Router(config)#arp {ip-address} {mac-address} arpa
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Used by a host to obtain the IP address associated with another host's MAC address
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);

42. What is added after the option field in the IPv4 header?
255.255.255.128
RIPv1 and IGRP
Padding of zeros to ensure that the header ends on a 32-bit boundary
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

43. What is ACK?
20 octets
Acknowledgement
8
All Internet Registries

44. Who administers and registers public IP address space and AS numbers within a country or economic unit?
ECN-Echo
NIRs
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Each router decrements the TTL

45. What is ICMP Type 10?
192.0.2.0/24
Used by a host to obtain the IP address associated with another host's MAC address
192.88.99.0/24
Router Selection

46. What is TCP?
Used by a host to obtain the IPv4 address associated with its own MAC address
IANA
Router(config-if)#no ip redirects
Transmission Control Protocol

47. What is ICMP Type 11?
RFC 791
255.255.255.128
Time Exceeded
255.255.255.252

48. What is the IPv4 Protocol number for EIGRP?
4
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
88
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

49. What is the minimum length of an IPv4 header?
20 octets
LIRs
Reserved (1-bit); DF (1-bit); MF (1-bit)
Echo Reply

50. Disables proxy ARP on all interfaces
Mostly large ISPs - enterprises - or academic institutions
More Fragments follow
Router(config)#ip arp proxy disable
RIPv1 and IGRP