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. Disables the sending of ICMP redirect messages
Router Selection
More Fragments follow
6
Router(config-if)#no ip redirects

2. Who assigns IP address space to its own customers?
They are the same byte - but the names and value interpretations are different
60 octets
Data Offset
LIRs

3. What is the format of an IPv4 header?
Sequence Numbers
Time Exceeded
RIPv1 and IGRP
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);

4. What is the the MF-bit in the IPv4 header?
RFC 791
6
More Fragments follow
Synchronize

5. What is the function of ICMP redirect messages?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Internet Control Message Protocol
Both the TCP header and the encapsulated data
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

6. What is the format of an ARP packet?
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
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Router(config-if)#no ip proxy-arp

7. Specifies the format in which subnet masks are displayed in show command output
1
Redirect
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
The next sequence number that the source expects to receive from the destination

8. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Length of header in words (32-bit)
ICANN
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
All Internet Registries

9. Who group public IPv4 address space by major geographic region?
IANA
46
ICANN and IANA
Router(config-if)#arp timeout {seconds}

10. What are the protocol categories that describe the physical layer?
Electrical/Optical - Mechanical - Functional and Procedural
Acknowledgement
Sequence Numbers
Push

11. What is the ARP Operation value for a Reverse ARP Request?
0x0800
3
An ARP request issued by a host with its own IPv4 address as the target address
ICANN

12. What is the maximum length of an IPv4 header?
60 octets
Uniquely identify every application in the network
Sequence Number + Data payload octets + 1
Maximum Segment Size (MSS)

13. Deletes dynamic entries from the ARP cache
Padding of zeros to ensure that the header ends on a 32-bit boundary
Router#clear arp-cache [{interface {interface}} | {ip-address}]
DSCP (6-bit); ECN (2-bit)
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

14. What is ECE?
255.255.255.128
4
ECN-Echo
ICANN and IANA

15. Disables proxy ARP on all interfaces
Mostly large ISPs - enterprises - or academic institutions
6
3
Router(config)#ip arp proxy disable

16. Which IPv4 address range is reserved for use in documentation and example code?
9
Electrical/Optical - Mechanical - Functional and Procedural
0x0800
192.0.2.0/24

17. What are classless routing protocols?
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 include subnet masks in their routing updates
Sequence Numbers
Echo

18. What is the prerequisite for using the Urgent Pointer field in the TCP header?
88
URG flag set
Destination Unreachable
Network interface

19. What routing protocols are classful?
Protocols that don't include subnet masks in their routing updates
RIPv1 and IGRP
Urgent
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

20. What is a TCP port number of an application called when it is coupled with the IP address of the server?
127.0.0.0/8
Network interface
Socket
3

21. Displays the ARP cache of a router
Padding of zeros to ensure that the header ends on a 32-bit boundary
2
DSCP (6-bit); ECN (2-bit)
Router#show arp

22. What is ICMP Type 8?
Echo
RFC 1918
Internet Assigned Numbers Authority
198.18.0.0/15

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

24. What is prefix /30 in decimal notation?
Router(config-if)#no ip proxy-arp
192.88.99.0/24
255.255.255.224
255.255.255.252

25. 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)
Router#clear arp-cache [{interface {interface}} | {ip-address}]
IANA
1

26. What are the most common IP version numbers?
Application
Each router decrements the TTL
Uniquely identify every application in the network
IPv4 and IPv6

27. What is the recommended default TTL?
4
Synchronize
RIPv1 and IGRP
64

28. What is the content of the the Urgent Pointer field in the TCP header?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
255.255.255.240
Length of header in words (32-bit)
Padding of zeros to ensure that the header ends on a 32-bit boundary

29. Who allocates public IP address ranges to NIRs or LIRs?
4
RIRs
Subtract Header Length field from Total Length field
URG flag set

30. What is covered by the TCP Checksum field?
Open Systems Interconnection
Both the TCP header and the encapsulated data
Internet Service Provider
3

31. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
192.88.99.0/24
IANA
255.255.255.248
192.0.2.0/24

32. What is the ARP Hardware address length value for Ethernet?
127.0.0.0/8
Network interface
2
6

33. What is a TCP Acknowledgement Number?
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
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
The next sequence number that the source expects to receive from the destination
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

34. What is prefix /27 in decimal notation?
IPv4 and IPv6
4
255.255.255.224
Network interface

35. What is ISP?
Internet Corporation for Assigned Network Numbers
Router#debug arp
Internet Service Provider
RIRs

36. Who allocates IP address space and AS numbers to RIRs?
1
IANA
2
Destination Unreachable

37. What is the first octet rule for IPv4 address classes in binary?
Per-Hop Behaviour (PHB)
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
More Fragments follow
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

38. What is IP?
Internet Protocol
Padding of zeros to ensure that the header ends on a 32-bit boundary
46
Mostly large ISPs - enterprises - or academic institutions

39. What are the IP Precedence values?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
255.255.255.192
6
RIRs

40. What is IANA?
Internet Assigned Numbers Authority
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
DHCP

41. What is the minimum length of an IPv4 header?
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#show arp
20 octets
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

42. What are the private IPv4 address ranges?
Acknowledgement
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
17
RIPv1 and IGRP

43. What is ARP?
All Internet Registries
Address Resolution Protocol
Loose source routing; Strict source routing; Record route; Timestamp
Used by IRDP on some operating systems to discover local routers

44. What is ICMP Type 11?
Time Exceeded
17
All Internet Registries
255.255.255.192

45. What is Inverse ARP?

46. What is added after the Option field in the TCP 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
Padding of zeros to ensure that the header ends on a 32-bit boundary
ICANN and IANA
Congestion Window Reduced

47. 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
More Fragments follow
255.255.255.240
0x0800

48. What is CWR?
255.255.255.252
Congestion Window Reduced
RIPv1 and IGRP
4

49. What is the IPv4 Protocol number of RSVP?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
RFC 791
Router Advertisement
46

50. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Sequence Number
Router(config-if)#arp timeout {seconds}
Subtract Header Length field from Total Length field