Test your basic knowledge |

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. Which protocol has mostly replaced Reverse ARP?
Used by a host to obtain the IP address associated with another host's MAC address
Per-Hop Behaviour (PHB)
Echo
DHCP

2. What are classless routing protocols?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
169.254.0.0/16
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 include subnet masks in their routing updates

3. What is prefix /29 in decimal notation?
255.255.255.248
Destination Unreachable
ECN-Echo
Socket

4. What routing protocols are classful?
Used by a host to obtain the IPv4 address associated with its own MAC address
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
RIPv1 and IGRP
Mostly large ISPs - enterprises - or academic institutions

5. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
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
Internet Service Provider
Host-to-host
Largest segment size that the sender is willing to accept

6. What is ACK?
4
Both the TCP header and the encapsulated data
3
Acknowledgement

7. What is the ARP Operation value for an Inverse ARP Request?
LIRs
Loose source routing; Strict source routing; Record route; Timestamp
Sequence Number
8

8. What is ICMP Type 0?
Echo Reply
20 octets
0.0.0.0/8
Socket

9. What is the first octet rule for IPv4 address classes in binary?
Redirect
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
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-if)#no ip redirects

10. What is IRDP?
ICMP Router Discovery Protocol
Time Exceeded
IANA
Both the TCP header and the encapsulated data

11. What is ARP?
Host-to-host
Address Resolution Protocol
127.0.0.0/8
Data Offset

12. Displays the ARP cache of a router
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 include subnet masks in their routing updates
Router#show arp
Time to Live

13. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
Padding of zeros to ensure that the header ends on a 32-bit boundary
RIRs
ECN-Echo

14. What is the minimum length of an IPv4 header?
20 octets
Length of header in words (32-bit)
Identifier; Flags and Fragmentation Offset
Echo Reply

15. What is ICMP Type 11?
Time Exceeded
Router(config-if)#no ip proxy-arp
Socket
8

16. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
198.18.0.0/15
An ARP request issued by a host with its own IPv4 address as the target address
Destination Unreachable
64

17. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Internet
Protocols that include subnet masks in their routing updates
RFC 1918
Router(config)#arp {ip-address} {mac-address} arpa

18. What is PSH?
192.88.99.0/24
Internet Service Provider
Subtract Header Length field from Total Length field
Push

19. What is IANA?
Internet Assigned Numbers Authority
255.255.255.240
2
IPv4 and IPv6

20. What is the ARP Hardware type value for Ethernet?
17
Internet Protocol
1
Echo Reply

21. Enables debugging output for ARP transactions
RIRs
Router#debug arp
6
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

22. What are the most common IP version numbers?
LIRs
Network interface
ICANN and IANA
IPv4 and IPv6

23. What is FIN?
Final
1
Regional Internet Registry
Internet Protocol

24. What is the IPv4 Protocol number for EIGRP?
RIPv1 and IGRP
Maximum Segment Size (MSS)
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

25. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Sequence Number
Per-Hop Behaviour (PHB)
The next sequence number that the source expects to receive from the destination
Echo

26. What is the format of a TCP header?
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
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
8
Router#clear arp-cache [{interface {interface}} | {ip-address}]

27. What is the other name for the TCP Header Length field?
Router(config)#arp {ip-address} {mac-address} arpa
Local Internet Registry
192.0.2.0/24
Data Offset

28. Who assigns IP address space to its own customers?
Final
Network interface
LIRs
4

29. What is the format of the DiffServ byte?
Maximum Segment Size (MSS)
DSCP (6-bit); ECN (2-bit)
255.255.255.224
All Internet Registries

30. Who allocates IP address space and AS numbers to RIRs?
IANA
Don't Fragment
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
Sequence Number

31. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
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);
Internet Service Provider
255.255.255.248
Sequence Number + Data payload octets + 1

32. What is the IPv4 protocol number for UDP?
2
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
17
IANA

33. What is prefix /30 in decimal notation?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
255.255.255.252
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
IANA

34. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
RIRs
Network interface
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
Protocols that don't include subnet masks in their routing updates

35. Who allocates public IP address ranges to NIRs or LIRs?
Push
Each router decrements the TTL
RIRs
Internet

36. What is gratuitous ARP?
An ARP request issued by a host with its own IPv4 address as the target address
Loose source routing; Strict source routing; Record route; Timestamp
Protocols that include subnet masks in their routing updates
ICMP Router Discovery Protocol

37. What is the format of the ToS field?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
2
ICANN
Length of header in words (32-bit)

38. Adds a permanent static ARP entry for an Ethernet host
3
46
Router(config-if)#no ip proxy-arp
Router(config)#arp {ip-address} {mac-address} arpa

39. What mechanisms are used by TCP to provide reliable segment delivery?
255.255.255.128
1
Mostly large ISPs - enterprises - or academic institutions
Acknowledgements - checksums and timers

40. Who administers and registers public IP address space and AS numbers within a country or economic unit?
Host-to-host
DHCP
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

41. Who group public IPv4 address space by major geographic region?
Router(config-if)#arp timeout {seconds}
ICANN and IANA
255.255.255.252
Time to Live

42. What is TCP?
Transmission Control Protocol
Router Selection
Both the TCP header and the encapsulated data
Uniquely identify every application in the network

43. What is prefix /27 in decimal notation?
198.18.0.0/15
255.255.255.224
An ARP request issued by a host with its own IPv4 address as the target address
Congestion Window Reduced

44. What is the IPv4 Protocol number for OSPF?
4
89
Reset
They are the same byte - but the names and value interpretations are different

45. What is the ARP Operation value for a Reverse ARP Request?
3
Push
IANA
An ARP request issued by a host with its own IPv4 address as the target address

46. What is IP?
ICANN
Internet Protocol
Open Systems Interconnection
Router#debug arp

47. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Internet Assigned Numbers Authority
Subtract Header Length field from Total Length field
LIRs
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

48. What is the format of an ARP packet?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Internet Control Message Protocol
1
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

49. What is ECE?
IPv4 and IPv6
ECN-Echo
9
Acknowledgements - checksums and timers

50. What is OSI?
0
0x0800
Internet Service Provider
Open Systems Interconnection