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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

2. What is the ARP Operation value for a Reverse ARP Request?
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
3
Router(config)#ip arp proxy disable
Internet Assigned Numbers Authority

3. What is ICMP Type 10?
Internet Service Provider
Redirect
Router Selection
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

4. What is the TTL field in the IPv4 header?
Time to Live
Identifier; Flags and Fragmentation Offset
RFC 3330
255.255.255.192

5. What is FIN?
Router(config)#ip arp proxy disable
Both the TCP header and the encapsulated data
255.255.255.224
Final

6. Why must the header checksum of an IPv4 packet be recalculated at every router?
255.255.255.224
The next sequence number that the source expects to receive from the destination
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Each router decrements the TTL

7. What are the private IPv4 address ranges?
Used by a host to obtain the IPv4 address associated with its own MAC address
IANA
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Mostly large ISPs - enterprises - or academic institutions

8. What is the IPv4 Protocol number for IGMP?
ECN-Echo
2
Address Resolution Protocol
RFC 1918

9. What is the ARP Hardware type value for Ethernet?
255.255.255.252
Padding of zeros to ensure that the header ends on a 32-bit boundary
Protocols that don't include subnet masks in their routing updates
1

10. What is IANA?
0.0.0.0/8
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)
Internet Assigned Numbers Authority

11. Disables proxy ARP on all interfaces
Router#clear arp-cache [{interface {interface}} | {ip-address}]
255.255.255.224
Congestion Window Reduced
Router(config)#ip arp proxy disable

12. What are the most frequently used options in the IPv4 header?
Host-to-host
169.254.0.0/16
Loose source routing; Strict source routing; Record route; Timestamp
Socket

13. What is the IPv4 Protocol number for IP in IP encapsulation?
ICMP Router Discovery Protocol
Router#debug arp
3
4

14. Deletes dynamic entries from the ARP cache
Internet Service Provider
Socket
Internet Control Message Protocol
Router#clear arp-cache [{interface {interface}} | {ip-address}]

15. What is ISP?
Socket
IANA
4
Internet Service Provider

16. What is SYN?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Synchronize
Echo
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

17. What is prefix /29 in decimal notation?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
255.255.255.248
Reserved (1-bit); DF (1-bit); MF (1-bit)
Congestion Window Reduced

18. What is ICANN?
RIRs
Internet Corporation for Assigned Network Numbers
Sequence Number
NIRs

19. What is the other name for the TCP Header Length field?
Identifier; Flags and Fragmentation Offset
Mostly large ISPs - enterprises - or academic institutions
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Data Offset

20. What is the IPv4 Protocol number for GRE?
RFC 1918
47
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Internet Control Message Protocol

21. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
Final
Host-to-host
Internet Assigned Numbers Authority
Sequence Number

22. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Subtract Header Length field from Total Length field
Congestion Window Reduced
0
Internet Service Provider

23. What are the steps to subnet an IPv4 address?
1
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
0x0800
9

24. Which RFC defines the private IPv4 address ranges?
Transmission Control Protocol
RFC 1918
Router(config-if)#no ip redirects
Mostly large ISPs - enterprises - or academic institutions

25. Which protocol has mostly replaced Reverse ARP?
198.18.0.0/15
Destination Unreachable
DHCP
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

26. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
IANA
Length of header in words (32-bit)
Address Resolution Protocol

27. What is the ARP Operation value for an ARP Reply?
Don't Fragment
IANA
2
Push

28. What is added after the option field in the IPv4 header?
Reserved (1-bit); DF (1-bit); MF (1-bit)
Per-Hop Behaviour (PHB)
Padding of zeros to ensure that the header ends on a 32-bit boundary
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

29. What IPv4 header fields are used for fragmentation?
Socket
Identifier; Flags and Fragmentation Offset
255.255.255.240
Length of header in words (32-bit)

30. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Per-Hop Behaviour (PHB)
RIPv1 and IGRP
All Internet Registries
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

31. 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
DHCP
0.0.0.0/8
Per-Hop Behaviour (PHB)

32. What is the ARP Protocol type value for IPv4?
0x0800
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);
Protocols that include subnet masks in their routing updates
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

33. What is the IPv4 Protocol number for TCP?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
6
ICANN
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

34. What is ICMP Type 0?
60 octets
Subtract Header Length field from Total Length field
Echo Reply
Host-to-host

35. What is NIR?
4
National Internet Registry
2
0.0.0.0/8

36. What is the format of an IPv4 header?
NIRs
Acknowledgement
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);
3

37. What is the ARP Operation value for an Inverse ARP Reply?
9
Padding of zeros to ensure that the header ends on a 32-bit boundary
Sequence Numbers
Sequence Number

38. What is prefix /27 in decimal notation?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
127.0.0.0/8
Acknowledgement
255.255.255.224

39. What is the Fragment Offset field in the IPv4 header?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Application
Router(config)#ip arp proxy disable
Local Internet Registry

40. What is CWR?
RIPv1 and IGRP
Congestion Window Reduced
IANA
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);

41. What is the recommended default TTL?
Sequence Number
64
255.255.255.192
Windowing

42. What is the format of the DiffServ byte?
255.255.255.192
RIPv1 and IGRP
DSCP (6-bit); ECN (2-bit)
Data Offset

43. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
Internet Service Provider
0.0.0.0/8
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
255.255.255.128

44. Displays the ARP cache of a router
2
Router#show arp
4
Local Internet Registry

45. What is the ARP Operation value for an ARP Request?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
1
Used by a host to obtain the IP address associated with another host's MAC address

46. What is the ARP Operation value for an Inverse ARP Request?
8
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
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
IANA

47. What is the format of the ToS byte in the IPv4 header?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
NIRs
All Internet Registries
Open Systems Interconnection

48. Who administers and registers IP address space and AS numbers within a region?
Regional Internet Registry
RIRs
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Open Systems Interconnection

49. What is the format of an ARP packet?
Length of header in words (32-bit)
Router Selection
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
Push

50. Who assigns IP address space to its own customers?
LIRs
DHCP
Router(config-if)#no ip proxy-arp
Final