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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 IP?
Internet Protocol
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
The next sequence number that the source expects to receive from the destination
Router(config)#ip arp proxy disable

2. What is the format of a UDP header?
2
46
1
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

3. What is the IPv4 Protocol number for EIGRP?
88
Length of header in words (32-bit)
Don't Fragment
255.255.255.248

4. Enables debugging output for ARP transactions
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
IANA
Don't Fragment
Router#debug arp

5. What is the Fragment Offset field in the IPv4 header?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Router Advertisement
255.255.255.192
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

6. What is the format of the Flags field in the IPv4 header?
Reserved (1-bit); DF (1-bit); MF (1-bit)
255.255.255.192
IANA
Urgent

7. Which IPv4 address range is reserved for loopback testing?
2
127.0.0.0/8
Internet Assigned Numbers Authority
The next sequence number that the source expects to receive from the destination

8. What is the difference between the ToS and the DiffServ byte?
Echo Reply
They are the same byte - but the names and value interpretations are different
Reserved (1-bit); DF (1-bit); MF (1-bit)
Uniquely identify every application in the network

9. What is ICMP Type 9?
4
RIPv1 and IGRP
Router Selection
Router Advertisement

10. What is ICMP Type 11?
Uniquely identify every application in the network
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Time Exceeded
255.255.255.224

11. Who assigns IP address space to its own customers?
255.255.255.128
LIRs
Router(config)#ip arp proxy disable
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

12. What are the protocol categories that describe the physical layer?
192.88.99.0/24
Electrical/Optical - Mechanical - Functional and Procedural
Uniquely identify every application in the network
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

13. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
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
Uniquely identify every application in the network
Router(config-if)#arp timeout {seconds}
Router(config-if)#no ip proxy-arp

14. What routing protocols are classful?
9
Redirect
RIPv1 and IGRP
47

15. What is the ARP Hardware type value for Ethernet?
1
Padding of zeros to ensure that the header ends on a 32-bit boundary
Echo Reply
Mostly large ISPs - enterprises - or academic institutions

16. What is the ARP Operation value for an Inverse ARP Reply?
Data Offset
Sequence Numbers
9
RIRs

17. What is ICMP Type 0?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
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
Echo Reply
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

18. What is the ARP Operation value for a Reverse ARP Request?
Network interface
Reset
3
Echo

19. Specifies the format in which subnet masks are displayed in show command output
Urgent
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
DSCP (6-bit); ECN (2-bit)
Router(config)#arp {ip-address} {mac-address} arpa

20. What is NIR?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Socket
National Internet Registry
Time to Live

21. Disables the sending of ICMP redirect messages
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Router(config-if)#no ip redirects
0.0.0.0/8
17

22. What is the content of the the Urgent Pointer field in the TCP header?
IANA
Internet Control Message Protocol
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Internet Service Provider

23. What is the content of the TCP Window Size field?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Mostly large ISPs - enterprises - or academic institutions
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 Protocol

24. Which IPv4 address range is reserved for self-identification on a local subnet?
Used by a host to obtain the IPv4 address associated with its own MAC address
89
IANA
0.0.0.0/8

25. Who allocates public IP address ranges to NIRs or LIRs?
Time to Live
6
RIRs
Application

26. What is the format of the Flags field in the TCP header?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
4
Protocols that don't include subnet masks in their routing updates
Router(config-if)#no ip proxy-arp

27. What IPv4 header fields are used for fragmentation?
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
1
Identifier; Flags and Fragmentation Offset
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

28. What is the IPv4 Protocol number for GRE?
47
0
Per-Hop Behaviour (PHB)
8

29. What is added after the option field in the IPv4 header?
Echo
1
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
Padding of zeros to ensure that the header ends on a 32-bit boundary

30. What is the IPv4 Protocol number for ICMP?
1
Protocols that include subnet masks in their routing updates
4
Mostly large ISPs - enterprises - or academic institutions

31. What is the IPv4 protocol number for UDP?
255.255.255.252
Internet Corporation for Assigned Network Numbers
RIRs
17

32. What is the the MF-bit in the IPv4 header?
Redirect
Reset
More Fragments follow
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);

33. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
RIPv1 and IGRP
198.18.0.0/15
Reset
Congestion Window Reduced

34. What is the ARP Operation value for an Inverse ARP Request?
8
Synchronize
Electrical/Optical - Mechanical - Functional and Procedural
An ARP request issued by a host with its own IPv4 address as the target address

35. What is RST?
Subtract Header Length field from Total Length field
Regional Internet Registry
Reset
Router(config)#ip arp proxy disable

36. What is PSH?
ECN-Echo
Push
Used by IRDP on some operating systems to discover local routers
RIRs

37. What is the ARP Protocol type value for IPv4?
4
Router#debug arp
192.0.2.0/24
0x0800

38. What is covered by the TCP Checksum field?
Both the TCP header and the encapsulated data
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
Network interface
Uniquely identify every application in the network

39. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
3
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Network interface

40. What is the first octet rule for IPv4 address classes in decimal?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
60 octets
NIRs
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

41. What is ICMP Type 10?
Internet Control Message Protocol
They are the same byte - but the names and value interpretations are different
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Router Selection

42. What are the steps to subnet an IPv4 address?
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
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
Sequence Number
ECN-Echo

43. What is the IPv4 Protocol number for IGMP?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
2
Protocols that include subnet masks in their routing updates
192.0.2.0/24

44. What is the format of the DiffServ byte?
2
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
DSCP (6-bit); ECN (2-bit)
0.0.0.0/8

45. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Length of header in words (32-bit)
Per-Hop Behaviour (PHB)
IPv4 and IPv6
Internet Control Message Protocol

46. What is added after the Option field in the TCP header?
2
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Padding of zeros to ensure that the header ends on a 32-bit boundary
Maximum Segment Size (MSS)

47. What is the ARP Operation value for a Reverse ARP Reply?
4
RFC 3330
Echo
Router(config-if)#arp timeout {seconds}

48. What mechanism is used by TCP to regulate the flow of segments?
Used by a host to obtain the IPv4 address associated with its own MAC address
46
Windowing
89

49. What is gratuitous ARP?
An ARP request issued by a host with its own IPv4 address as the target address
RIRs
IANA
Transmission Control Protocol

50. What is a TCP Acknowledgement Number?
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
255.255.255.224
The next sequence number that the source expects to receive from the destination
Acknowledgement