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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. Who administers and registers IP address space and AS numbers within a region?
46
17
RIRs
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);

2. What are classful routing protocols?

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3. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
Application
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
47

4. What is the function of ICMP redirect messages?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Both the TCP header and the encapsulated data
0
They are the same byte - but the names and value interpretations are different

5. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
4
RFC 3330
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Sequence Number

6. What is prefix /27 in decimal notation?
255.255.255.224
ICANN
Router#show arp
Time to Live

7. Who are LIRs?
Mostly large ISPs - enterprises - or academic institutions
The next sequence number that the source expects to receive from the destination
Sequence Number
64

8. What is the ARP Operation value for a Reverse ARP Request?
Congestion Window Reduced
47
An ARP request issued by a host with its own IPv4 address as the target address
3

9. Which IPv4 address range is reserved for use in documentation and example code?
192.0.2.0/24
192.88.99.0/24
Sequence Numbers
198.18.0.0/15

10. 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
Socket
Identifier; Flags and Fragmentation Offset
2

11. What is TCP?
Padding of zeros to ensure that the header ends on a 32-bit boundary
60 octets
3
Transmission Control Protocol

12. What is the format of the ToS byte in the IPv4 header?
Router#show arp
60 octets
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Maximum Segment Size (MSS)

13. What are the private IPv4 address ranges?
88
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
ICMP Router Discovery Protocol
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

14. Disables the sending of ICMP redirect messages
47
Router(config-if)#no ip redirects
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
LIRs

15. What is ICANN?
255.255.255.128
Identifier; Flags and Fragmentation Offset
Internet Corporation for Assigned Network Numbers
Acknowledgement

16. What is the format of the Flags field in the IPv4 header?
Sequence Number
Reserved (1-bit); DF (1-bit); MF (1-bit)
0
Final

17. What is SYN?
Protocols that don't include subnet masks in their routing updates
20 octets
Synchronize
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

18. 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
Acknowledgements - checksums and timers
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
0x0800

19. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
IANA
Internet Assigned Numbers Authority
0x0800
RIRs

20. What is IP?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
RFC 791
Internet Protocol
They are the same byte - but the names and value interpretations are different

21. What mechanisms are used by TCP to provide reliable segment delivery?
Router(config-if)#arp timeout {seconds}
The next sequence number that the source expects to receive from the destination
Router(config)#ip arp proxy disable
Acknowledgements - checksums and timers

22. Which RFC defines IPv4?
NIRs
Mostly large ISPs - enterprises - or academic institutions
Data Offset
RFC 791

23. What is the IPv4 Protocol number for IGMP?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
64
2
46

24. What is the recommended default TTL?
National Internet Registry
0
64
89

25. What is RIR?
LIRs
6
Regional Internet Registry
192.0.2.0/24

26. What is a TCP Acknowledgement Number?
20 octets
Router#show arp
Don't Fragment
The next sequence number that the source expects to receive from the destination

27. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Internet
255.255.255.224
255.255.255.252
ICMP Router Discovery Protocol

28. Who allocates public IP address ranges to NIRs or LIRs?
Internet Service Provider
Each router decrements the TTL
RIRs
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

29. What is prefix /29 in decimal notation?
4
255.255.255.248
Open Systems Interconnection
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

30. What is the IPv4 Protocol number for IP in IP encapsulation?
Router(config)#arp {ip-address} {mac-address} arpa
Used by IRDP on some operating systems to discover local routers
4
Router#debug arp

31. What is RST?
IANA
Reset
89
Used by a host to obtain the IP address associated with another host's MAC address

32. What is the Fragment Offset field in the IPv4 header?
Push
Router(config-if)#arp timeout {seconds}
4
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

33. What is LIR?
1
Reserved (1-bit); DF (1-bit); MF (1-bit)
Internet Control Message Protocol
Local Internet Registry

34. What is ISP?
DSCP (6-bit); ECN (2-bit)
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
Internet Service Provider
ICMP Router Discovery Protocol

35. What is the content of the the Urgent Pointer field in the TCP header?
RIPv1 and IGRP
Host-to-host
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

36. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
More Fragments follow
Network interface
All Internet Registries

37. Which IPv4 address range is reserved for loopback testing?
6
Internet Protocol
They are the same byte - but the names and value interpretations are different
127.0.0.0/8

38. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
8
1
Host-to-host
Echo Reply

39. What is the function of ICMP router advertisement and router selection messages?
Internet Protocol
Router#show arp
Used by IRDP on some operating systems to discover local routers
Congestion Window Reduced

40. What is the ARP Operation value for an ARP Request?
1
Time Exceeded
Router(config-if)#no ip proxy-arp
Application

41. What is the value of the TCP Reserved field?
0
Echo
ICMP Router Discovery Protocol
8

42. What mechanism is used by TCP to provided ordered segment delivery?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Echo
Per-Hop Behaviour (PHB)
Sequence Numbers

43. What are the steps to subnet an IPv4 address?
198.18.0.0/15
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
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Router(config-if)#no ip proxy-arp

44. What is prefix /25 in decimal notation?
255.255.255.128
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
Protocols that don't include subnet masks in their routing updates
Push

45. What is IANA?
2
Internet Assigned Numbers Authority
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
RFC 791

46. What is the format of the DiffServ byte?
1
DSCP (6-bit); ECN (2-bit)
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Internet Control Message Protocol

47. What are the protocol categories that describe the physical layer?
Electrical/Optical - Mechanical - Functional and Procedural
Destination Unreachable
Internet Protocol
3

48. What is ICMP Type 5?
1
Sequence Number + Data payload octets + 1
Redirect
Open Systems Interconnection

49. Disables proxy ARP on all interfaces
Router(config)#ip arp proxy disable
Time to Live
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
ECN-Echo

50. Adds a permanent static ARP entry for an Ethernet host
IANA
Sequence Number + Data payload octets + 1
Router(config)#arp {ip-address} {mac-address} arpa
Local Internet Registry