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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. What is LIR?
8
Local Internet Registry
They are the same byte - but the names and value interpretations are different
Router Selection

2. Who assigns IP address space to its own customers?
89
0.0.0.0/8
LIRs
Internet Protocol

3. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
169.254.0.0/16
IANA
Mostly large ISPs - enterprises - or academic institutions
Sequence Number + Data payload octets + 1

4. What is prefix /30 in decimal notation?
Redirect
47
Each router decrements the TTL
255.255.255.252

5. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Router(config-if)#arp timeout {seconds}
127.0.0.0/8
NIRs

6. What is ICMP Type 5?
Destination Unreachable
Internet Assigned Numbers Authority
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);

7. What is the IPv4 Protocol number for IGMP?
Push
60 octets
2
They are the same byte - but the names and value interpretations are different

8. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Time to Live
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

9. Who are LIRs?
Internet Service Provider
Mostly large ISPs - enterprises - or academic institutions
Router#clear arp-cache [{interface {interface}} | {ip-address}]
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

10. What are the most common IP version numbers?
IPv4 and IPv6
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
More Fragments follow
IANA

11. What is the ARP Operation value for an ARP Request?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
ICMP Router Discovery Protocol
46
1

12. Which protocol has mostly replaced Reverse ARP?
DHCP
Acknowledgements - checksums and timers
Open Systems Interconnection
IANA

13. What is the value of the TCP Reserved field?
RFC 791
RIRs
6
0

14. What is the Fragment Offset field in the IPv4 header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Internet Corporation for Assigned Network Numbers
Final

15. What is IANA?
20 octets
Internet Assigned Numbers Authority
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Per-Hop Behaviour (PHB)

16. Which RFC defines the private IPv4 address ranges?
Sequence Number + Data payload octets + 1
255.255.255.248
169.254.0.0/16
RFC 1918

17. What is OSI?
Address Resolution Protocol
Each router decrements the TTL
Largest segment size that the sender is willing to accept
Open Systems Interconnection

18. What is the format of an IPv4 header?
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
1
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(config)#arp {ip-address} {mac-address} arpa

19. What are the uses of gratuitous ARP?
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
Padding of zeros to ensure that the header ends on a 32-bit boundary
RIRs

20. What mechanisms are used by TCP to provide reliable segment delivery?
Destination Unreachable
Acknowledgements - checksums and timers
255.255.255.128
Router#show arp

21. What is SYN?
Identifier; Flags and Fragmentation Offset
47
Synchronize
Time Exceeded

22. What is the format of a TCP header?
Local Internet Registry
47
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

23. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
DHCP
Sequence Number
ICANN
255.255.255.248

24. What is the ARP Operation value for a Reverse ARP Reply?
4
Regional Internet Registry
Congestion Window Reduced
89

25. Disables the sending of ICMP redirect messages
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
2
Router(config-if)#no ip redirects
Internet

26. Who allocates public IP address ranges to NIRs or LIRs?
Internet Service Provider
Destination Unreachable
Socket
RIRs

27. What is the IPv4 Protocol number for GRE?
4
2
47
0x0800

28. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Application
Loose source routing; Strict source routing; Record route; Timestamp
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
Don't Fragment

29. What is proxy ARP?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Router Advertisement
Host-to-host
Sequence Number + Data payload octets + 1

30. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
Uniquely identify every application in the network
RFC 791
127.0.0.0/8
IANA

31. What is prefix /28 in decimal notation?
255.255.255.240
Router(config)#arp {ip-address} {mac-address} arpa
ICMP Router Discovery Protocol
ECN-Echo

32. What is the format of the ToS field?
Loose source routing; Strict source routing; Record route; Timestamp
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Internet Service Provider
Router Advertisement

33. Which IPv4 address range is reserved for use in documentation and example code?
Router(config-if)#no ip proxy-arp
1
Acknowledgement
192.0.2.0/24

34. What is the IPv4 Protocol number for TCP?
89
Host-to-host
255.255.255.240
6

35. What are the most frequently used options in the IPv4 header?
The next sequence number that the source expects to receive from the destination
Electrical/Optical - Mechanical - Functional and Procedural
Subtract Header Length field from Total Length field
Loose source routing; Strict source routing; Record route; Timestamp

36. What is the ARP Operation value for an Inverse ARP Request?
Router#debug arp
8
RIRs
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

37. What is the function of ICMP router advertisement and router selection messages?
Used by IRDP on some operating systems to discover local routers
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
0.0.0.0/8
Largest segment size that the sender is willing to accept

38. Who administers and registers IP address space and AS numbers within a region?
RIRs
ICANN and IANA
Sequence Number + Data payload octets + 1
Length of header in words (32-bit)

39. What is ICMP Type 3?
Destination Unreachable
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Socket
Application

40. What are classful routing protocols?

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41. What is Reverse ARP?
Used by a host to obtain the IPv4 address associated with its own MAC address
88
255.255.255.128
NIRs

42. Displays the ARP cache of a router
Socket
2
Identifier; Flags and Fragmentation Offset
Router#show arp

43. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
Router#debug arp
1
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Host-to-host

44. What is the ARP Protocol type value for IPv4?
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
Acknowledgements - checksums and timers
Router(config-if)#no ip proxy-arp
0x0800

45. What routing protocols are classful?
46
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
RIPv1 and IGRP
1

46. What is ICMP Type 8?
4
Subtract Header Length field from Total Length field
Echo
RFC 1918

47. What is the the MF-bit in the IPv4 header?
Sequence Number + Data payload octets + 1
Electrical/Optical - Mechanical - Functional and Procedural
More Fragments follow
Each router decrements the TTL

48. What mechanism is used by TCP to provided ordered segment delivery?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
ICANN and IANA
Sequence Numbers
Router(config-if)#arp timeout {seconds}

49. What is ARP?
Socket
RIRs
Address Resolution Protocol
192.88.99.0/24

50. What is PSH?
Push
RIRs
National Internet Registry
ICMP Router Discovery Protocol