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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 IPv4 Protocol number of RSVP?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
46
Congestion Window Reduced
Hardware type (16-bit); Protocol type (16-bit); Hardware address length (8-bit); Protocol address length (8-bit); Operation (16-bit); Sender hardware address; Sender protocol address; Target hardware address; Target protocol address

2. Which RFC defines IPv4?
National Internet Registry
DSCP (6-bit); ECN (2-bit)
RFC 791
192.88.99.0/24

3. What is the format of the TCP Header Length field?
192.0.2.0/24
Each router decrements the TTL
Sequence Number
Length of header in words (32-bit)

4. Adds a permanent static ARP entry for an Ethernet host
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
Router(config)#arp {ip-address} {mac-address} arpa
URG flag set

5. Disables the sending of ICMP redirect messages
Socket
Padding of zeros to ensure that the header ends on a 32-bit boundary
RFC 1918
Router(config-if)#no ip redirects

6. What is the IPv4 Protocol number for IP in IP encapsulation?
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
2
255.255.255.248
4

7. What is SYN?
9
Synchronize
169.254.0.0/16
255.255.255.240

8. What is added after the Option field in the TCP header?
IANA
Socket
8
Padding of zeros to ensure that the header ends on a 32-bit boundary

9. What is the format of a UDP header?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
URG flag set
46
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

10. What are the most common IP version numbers?
Protocols that include subnet masks in their routing updates
NIRs
Reset
IPv4 and IPv6

11. What routing protocols are classful?
Router(config)#arp {ip-address} {mac-address} arpa
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
RIPv1 and IGRP
9

12. What IPv4 header fields are used for fragmentation?
Identifier; Flags and Fragmentation Offset
Router Selection
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Redirect

13. What is the format of an IPv4 header?
Sequence Number + Data payload octets + 1
192.0.2.0/24
Redirect
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);

14. Who assigns IP address space to its own customers?
An ARP request issued by a host with its own IPv4 address as the target address
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
LIRs
Router(config-if)#no ip proxy-arp

15. Who administers and registers public IP address space and AS numbers within a country or economic unit?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
RIPv1 and IGRP
Reserved (1-bit); DF (1-bit); MF (1-bit)
NIRs

16. What is prefix /30 in decimal notation?
Urgent
Loose source routing; Strict source routing; Record route; Timestamp
255.255.255.252
60 octets

17. What is the format of the ToS field?
Internet Control Message Protocol
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Push
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

18. What is OSI?
Open Systems Interconnection
Sequence Number
Internet Assigned Numbers Authority
IANA

19. What is the IPv4 Protocol number for OSPF?
Acknowledgement
ICMP Router Discovery Protocol
89
Network interface

20. What is RIR?
Regional Internet Registry
0
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Acknowledgement

21. What is the IPv4 Protocol number for ICMP?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
0x0800
Echo
1

22. What is the maximum length of an IPv4 header?
255.255.255.192
Internet Corporation for Assigned Network Numbers
60 octets
URG flag set

23. Which IPv4 address range is reserved for use in documentation and example code?
Hardware type (16-bit); Protocol type (16-bit); Hardware address length (8-bit); Protocol address length (8-bit); Operation (16-bit); Sender hardware address; Sender protocol address; Target hardware address; Target protocol address
192.0.2.0/24
Synchronize
Subtract Header Length field from Total Length field

24. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Reserved (1-bit); DF (1-bit); MF (1-bit)
17
ICANN
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

25. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
IANA
Used by a host to obtain the IP address associated with another host's MAC address
Sequence Number
17

26. What is the content of the the Urgent Pointer field in the TCP header?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Address Resolution Protocol
88
More Fragments follow

27. Who allocates public IP address ranges to NIRs or LIRs?
RIRs
Internet Control Message Protocol
Redirect
198.18.0.0/15

28. What is ACK?
Acknowledgement
Time Exceeded
More Fragments follow
8

29. What is prefix /28 in decimal notation?
LIRs
192.88.99.0/24
255.255.255.240
Final

30. What is the format of a TCP header?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Router(config)#ip arp proxy disable
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
9

31. What is ECE?
An ARP request issued by a host with its own IPv4 address as the target address
2
1
ECN-Echo

32. What is the format of the ToS byte in the IPv4 header?
National Internet Registry
17
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
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

33. What is the format of the DiffServ byte?
DSCP (6-bit); ECN (2-bit)
Electrical/Optical - Mechanical - Functional and Procedural
URG flag set
198.18.0.0/15

34. What is the ARP Operation value for an ARP Request?
1
Maximum Segment Size (MSS)
Time Exceeded
6

35. What is the name of the queuing and forwarding of IP packets based on DiffServ?
17
Used by IRDP on some operating systems to discover local routers
Per-Hop Behaviour (PHB)
Local Internet Registry

36. What is the value of the TCP Reserved field?
Both the TCP header and the encapsulated data
Router(config-if)#no ip redirects
Open Systems Interconnection
0

37. What is PSH?
Push
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
National Internet Registry
ICANN and IANA

38. What is NIR?
National Internet Registry
Internet Control Message Protocol
169.254.0.0/16
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

39. What is the ARP Hardware address length value for Ethernet?
6
Echo
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

40. What is the DF-bit in the IPv4 header?

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41. What is the ARP Operation value for an ARP Reply?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
2
Subtract Header Length field from Total Length field
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

42. What is prefix /26 in decimal notation?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
255.255.255.192
An ARP request issued by a host with its own IPv4 address as the target address
IANA

43. What is the prerequisite for using the Urgent Pointer field in the TCP header?
Router(config)#arp {ip-address} {mac-address} arpa
URG flag set
Don't Fragment
192.88.99.0/24

44. What is the the MF-bit in the IPv4 header?
More Fragments follow
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

45. What is the IPv4 Protocol number for EIGRP?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
255.255.255.128
Sequence Number + Data payload octets + 1
88

46. Who group public IPv4 address space by major geographic region?
Echo Reply
ICANN and IANA
URG flag set
192.88.99.0/24

47. What is the TTL field in the IPv4 header?
The next sequence number that the source expects to receive from the destination
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Time to Live
2

48. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
2
Echo Reply
Time to Live
169.254.0.0/16

49. What is the difference between the ToS and the DiffServ byte?
Echo Reply
They are the same byte - but the names and value interpretations are different
6
255.255.255.192

50. What is the format of the Flags field in the TCP header?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Acknowledgement