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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 covered by the TCP Checksum field?
Both the TCP header and the encapsulated data
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
0

2. What is the IPv4 Protocol number for OSPF?
89
Regional Internet Registry
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

3. What is the ARP Operation value for an ARP Reply?
Host-to-host
47
2
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

4. Disables proxy ARP on all interfaces
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);
192.0.2.0/24
4
Router(config)#ip arp proxy disable

5. What routing protocols are classful?
255.255.255.224
IANA
Congestion Window Reduced
RIPv1 and IGRP

6. What is the minimum length of an IPv4 header?
127.0.0.0/8
20 octets
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
198.18.0.0/15

7. Which RFC defines the special use IPv4 address ranges?
Used by a host to obtain the IPv4 address associated with its own MAC address
Router#show arp
RFC 3330
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

8. What is OSI?
Application
Regional Internet Registry
Router#debug arp
Open Systems Interconnection

9. What is the purpose of a socket?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Uniquely identify every application in the network
1
Identifier; Flags and Fragmentation Offset

10. What is the IPv4 Protocol number for EIGRP?
DHCP
Destination Unreachable
1
88

11. What is the most commonly used Option field in the TCP header?
Reset
255.255.255.192
Maximum Segment Size (MSS)
Per-Hop Behaviour (PHB)

12. Who can assign IP address space to end user organizations?
Sequence Numbers
Router(config-if)#arp timeout {seconds}
All Internet Registries
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

13. What is the ARP Operation value for a Reverse ARP Reply?
Largest segment size that the sender is willing to accept
60 octets
Internet Assigned Numbers Authority
4

14. 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
Redirect
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

15. What is the ARP Operation value for an Inverse ARP Request?
8
Echo Reply
Router Advertisement
9

16. What is gratuitous ARP?
Router#show arp
An ARP request issued by a host with its own IPv4 address as the target address
DHCP
ICANN and IANA

17. What is ICMP Type 9?
Router Advertisement
ICMP Router Discovery Protocol
Subtract Header Length field from Total Length field
Address Resolution Protocol

18. What is ECE?
ECN-Echo
Don't Fragment
8
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

19. What is prefix /29 in decimal notation?
255.255.255.248
Used by IRDP on some operating systems to discover local routers
255.255.255.252
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

20. What is prefix /28 in decimal notation?
255.255.255.240
Router Advertisement
Push
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

21. What mechanisms are used by TCP to provide reliable segment delivery?
Router#debug arp
Acknowledgements - checksums and timers
64
RIRs

22. What is the format of a TCP header?
4
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-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
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

23. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
198.18.0.0/15
Final
127.0.0.0/8
IANA

24. What is ISP?
17
Internet Service Provider
46
NIRs

25. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
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
192.88.99.0/24
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
Local Internet Registry

26. What is the ARP Hardware type value for Ethernet?
IPv4 and IPv6
1
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
National Internet Registry

27. What is the value of the TCP Reserved field?
Windowing
Open Systems Interconnection
0
Used by a host to obtain the IPv4 address associated with its own MAC address

28. What is added after the Option field in the TCP header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Internet Corporation for Assigned Network Numbers
Synchronize
64

29. What is SYN?
Synchronize
255.255.255.128
Uniquely identify every application in the network
Internet Service Provider

30. What is ACK?
Acknowledgement
Padding of zeros to ensure that the header ends on a 32-bit boundary
Identifier; Flags and Fragmentation Offset
255.255.255.224

31. What is NIR?
National Internet Registry
More Fragments follow
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

32. Which protocol has mostly replaced Reverse ARP?
Internet Control Message Protocol
DHCP
IPv4 and IPv6
IANA

33. Enables debugging output for ARP transactions
Length of header in words (32-bit)
47
Router#debug arp
ICANN

34. What is the IPv4 protocol number for UDP?
17
Congestion Window Reduced
All Internet Registries
Router Advertisement

35. What IPv4 header fields are used for fragmentation?
Length of header in words (32-bit)
Synchronize
Identifier; Flags and Fragmentation Offset
Sequence Number + Data payload octets + 1

36. What is the ARP Operation value for an Inverse ARP Reply?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Both the TCP header and the encapsulated data
9
Open Systems Interconnection

37. What is ICMP Type 3?
RFC 791
Padding of zeros to ensure that the header ends on a 32-bit boundary
Used by IRDP on some operating systems to discover local routers
Destination Unreachable

38. What is RST?
Acknowledgements - checksums and timers
Address Resolution Protocol
RIPv1 and IGRP
Reset

39. What is ICMP Type 10?
Router Selection
Open Systems Interconnection
They are the same byte - but the names and value interpretations are different
Subtract Header Length field from Total Length field

40. What is the IPv4 Protocol number for TCP?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
6
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);

41. What is FIN?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Final
Each router decrements the TTL
IANA

42. What is prefix /30 in decimal notation?
255.255.255.252
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
255.255.255.224

43. What are the most common IP version numbers?
Identifier; Flags and Fragmentation Offset
Local Internet Registry
4
IPv4 and IPv6

44. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
Per-Hop Behaviour (PHB)
198.18.0.0/15
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Length of header in words (32-bit)

45. 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
RFC 3330
Internet Assigned Numbers Authority
Destination Unreachable

46. What is the IPv4 Protocol number of RSVP?
46
Router(config-if)#arp timeout {seconds}
0x0800
Internet Control Message Protocol

47. What is the TTL field in the IPv4 header?
Internet Control Message Protocol
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Open Systems Interconnection
Time to Live

48. Who group public IPv4 address space by major geographic region?
Both the TCP header and the encapsulated data
255.255.255.224
6
ICANN and IANA

49. What is URG?
Router(config-if)#arp timeout {seconds}
Urgent
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Sequence Number

50. What is the content of the the Urgent Pointer field in the TCP header?
NIRs
Protocols that include subnet masks in their routing updates
Final
Number of octets to be added to the Sequence Number to indicate the end of the urgent data