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IPV4 Addressing

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Final
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
Transmission Control Protocol
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

2. What is prefix /29 in decimal notation?
IPv4 and IPv6
Urgent
255.255.255.248
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

3. What is ECE?
Acknowledgements - checksums and timers
IANA
ECN-Echo
Router#clear arp-cache [{interface {interface}} | {ip-address}]

4. What is the most commonly used Option field in the TCP header?
Maximum Segment Size (MSS)
Internet Service Provider
Mostly large ISPs - enterprises - or academic institutions
Reserved (1-bit); DF (1-bit); MF (1-bit)

5. Who group public IPv4 address space by major geographic region?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Router(config-if)#no ip proxy-arp
Used by IRDP on some operating systems to discover local routers
ICANN and IANA

6. What is added after the Option field in the TCP header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Loose source routing; Strict source routing; Record route; Timestamp
Acknowledgements - checksums and timers
6

7. What is ICMP Type 10?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
NIRs
More Fragments follow
Router Selection

8. What is the format of an ARP packet?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
192.88.99.0/24
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
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

9. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
192.88.99.0/24
198.18.0.0/15
Data Offset
64

10. What is the prerequisite for using the Urgent Pointer field in the TCP header?
URG flag set
Echo Reply
Uniquely identify every application in the network
8

11. What is a TCP Acknowledgement Number?
The next sequence number that the source expects to receive from the destination
Mostly large ISPs - enterprises - or academic institutions
RIRs
9

12. What is the format of an ICMP header?
RFC 791
Acknowledgements - checksums and timers
Time to Live
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

13. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
Internet Protocol
Length of header in words (32-bit)
Protocols that include subnet masks in their routing updates
198.18.0.0/15

14. What is the format of the ToS field?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Echo Reply
Electrical/Optical - Mechanical - Functional and Procedural

15. Which RFC defines IPv4?
RFC 791
Internet Protocol
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Reset

16. What is the ARP Hardware type value for Ethernet?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
DHCP
1
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

17. What is added after the option field in the IPv4 header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Internet Assigned Numbers Authority
Internet Service Provider
6

18. Who allocates public IP address ranges to NIRs or LIRs?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Reset
RIRs
Router(config-if)#arp timeout {seconds}

19. 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
192.0.2.0/24
Used by a host to obtain the IP address associated with another host's MAC address
Acknowledgements - checksums and timers

20. What is the IPv4 Protocol number for IGMP?
Router Advertisement
6
2
IPv4 and IPv6

21. What is the TTL field in the IPv4 header?
Don't Fragment
Time to Live
Sequence Number + Data payload octets + 1
Windowing

22. Who can assign IP address space to end user organizations?
RIRs
All Internet Registries
NIRs
Internet Assigned Numbers Authority

23. What are the most common IP version numbers?
Protocols that don't include subnet masks in their routing updates
89
IPv4 and IPv6
Router#debug arp

24. What are the steps to subnet an IPv4 address?
Uniquely identify every application in the network
Protocols that don't include subnet masks in their routing updates
NIRs
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

25. What is LIR?
1
Local Internet Registry
Reserved (1-bit); DF (1-bit); MF (1-bit)
Router#debug arp

26. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
Internet Control Message Protocol
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
Largest segment size that the sender is willing to accept

27. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
RFC 1918
RIRs
IANA
17

28. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Internet
Router(config)#arp {ip-address} {mac-address} arpa
Reserved (1-bit); DF (1-bit); MF (1-bit)
20 octets

29. What is ICANN?
National Internet Registry
Internet Corporation for Assigned Network Numbers
IANA
192.88.99.0/24

30. What is the IPv4 Protocol number for OSPF?
ICMP Router Discovery Protocol
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
Router#show arp
89

31. Who assigns IP address space to its own customers?
20 octets
47
LIRs
17

32. Which RFC defines the special use IPv4 address ranges?
255.255.255.128
RFC 3330
Identifier; Flags and Fragmentation Offset
Synchronize

33. What is prefix /27 in decimal notation?
URG flag set
Internet Control Message Protocol
255.255.255.224
Internet Protocol

34. Which IPv4 address range is reserved for loopback testing?
Host-to-host
Address Resolution Protocol
Redirect
127.0.0.0/8

35. What are classless routing protocols?
Acknowledgements - checksums and timers
Protocols that include subnet masks in their routing updates
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
6

36. What is the IPv4 Protocol number for EIGRP?
Router#show arp
88
0x0800
192.0.2.0/24

37. What is the format of the TCP Header Length field?
Final
Length of header in words (32-bit)
255.255.255.192
Padding of zeros to ensure that the header ends on a 32-bit boundary

38. What is the ARP Operation value for a Reverse ARP Request?
Urgent
3
89
Router(config-if)#no ip redirects

39. What are the most frequently used options in the IPv4 header?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Loose source routing; Strict source routing; Record route; Timestamp
DHCP
127.0.0.0/8

40. What is the IPv4 Protocol number for TCP?
Mostly large ISPs - enterprises - or academic institutions
6
Internet Assigned Numbers Authority
Each router decrements the TTL

41. Which protocol has mostly replaced Reverse ARP?
IANA
DHCP
255.255.255.224
They are the same byte - but the names and value interpretations are different

42. What is FIN?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Final
2
RIRs

43. What is proxy ARP?
Reserved (1-bit); DF (1-bit); MF (1-bit)
Padding of zeros to ensure that the header ends on a 32-bit boundary
4
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

44. What is prefix /25 in decimal notation?
255.255.255.128
Address Resolution Protocol
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
IANA

45. What is the IPv4 protocol number for UDP?
17
Length of header in words (32-bit)
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
60 octets

46. Which IPv4 address range is reserved for self-identification on a local subnet?
0.0.0.0/8
Length of header in words (32-bit)
Data Offset
RFC 1918

47. What is RST?
Reset
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
Subtract Header Length field from Total Length field
Router(config)#ip arp proxy disable

48. What is the ARP Operation value for an Inverse ARP Reply?
9
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
ECN-Echo
4

49. What is the ARP Protocol type value for IPv4?
0x0800
6
Router#debug arp
All Internet Registries

50. Which RFC defines the private IPv4 address ranges?
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
89
Router Advertisement
RFC 1918