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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 mechanisms are used by TCP to provide reliable segment delivery?
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
Acknowledgements - checksums and timers
0x0800

2. What is ICMP Type 10?
6
RFC 1918
255.255.255.252
Router Selection

3. What are the protocol categories that describe the physical layer?
Router(config)#arp {ip-address} {mac-address} arpa
They are the same byte - but the names and value interpretations are different
All Internet Registries
Electrical/Optical - Mechanical - Functional and Procedural

4. What is ECE?
ECN-Echo
2
Regional Internet Registry
Final

5. What is the format of the Flags field in the IPv4 header?
Reserved (1-bit); DF (1-bit); MF (1-bit)
Congestion Window Reduced
IANA
RIPv1 and IGRP

6. What are classful routing protocols?

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7. What is the ARP Hardware type value for Ethernet?
Router#show arp
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Router(config)#arp {ip-address} {mac-address} arpa
1

8. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
Used by a host to obtain the IPv4 address associated with its own MAC address
Subtract Header Length field from Total Length field
Acknowledgements - checksums and timers
Padding of zeros to ensure that the header ends on a 32-bit boundary

9. Who administers and registers IP address space and AS numbers within a region?
RIRs
Echo
60 octets
2

10. What routing protocols are classful?
Internet Service Provider
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
RIPv1 and IGRP
255.255.255.224

11. What is prefix /27 in decimal notation?
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
Padding of zeros to ensure that the header ends on a 32-bit boundary
255.255.255.224

12. What is the format of the DiffServ byte?
6
Each router decrements the TTL
Used by a host to obtain the IPv4 address associated with its own MAC address
DSCP (6-bit); ECN (2-bit)

13. What is covered by the TCP Checksum field?
Both the TCP header and the encapsulated data
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
8
The next sequence number that the source expects to receive from the destination

14. What is ACK?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Acknowledgement
47
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

15. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
They are the same byte - but the names and value interpretations are different
0x0800
Sequence Number + Data payload octets + 1

16. What is ICMP Type 5?
Time to Live
IANA
Redirect
127.0.0.0/8

17. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Windowing
The next sequence number that the source expects to receive from the destination
Sequence Number

18. What is the IPv4 Protocol number for IP in IP encapsulation?
4
Address Resolution Protocol
RIPv1 and IGRP
Internet Service Provider

19. Deletes dynamic entries from the ARP cache
9
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Router(config)#arp {ip-address} {mac-address} arpa
169.254.0.0/16

20. What is Inverse ARP?

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21. Who group public IPv4 address space by major geographic region?
46
ICANN and IANA
Internet Control Message Protocol
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

22. Disables proxy ARP on an interface
An ARP request issued by a host with its own IPv4 address as the target address
Router(config-if)#no ip proxy-arp
255.255.255.240
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

23. What is ICMP?
Largest segment size that the sender is willing to accept
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Internet Control Message Protocol
Final

24. 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
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Open Systems Interconnection
The next sequence number that the source expects to receive from the destination

25. What mechanism is used by TCP to regulate the flow of segments?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Windowing
Router(config-if)#no ip redirects
Internet Assigned Numbers Authority

26. Why must the header checksum of an IPv4 packet be recalculated at every router?
They are the same byte - but the names and value interpretations are different
Each router decrements the TTL
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Redirect

27. What is the format of the ToS byte in the IPv4 header?
192.88.99.0/24
89
Internet Corporation for Assigned Network Numbers
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

28. What is FIN?
Network interface
National Internet Registry
0x0800
Final

29. Who assigns IP address space to its own customers?
LIRs
0x0800
URG flag set
Synchronize

30. Disables the sending of ICMP redirect messages
Router(config-if)#no ip redirects
9
Used by a host to obtain the IP address associated with another host's MAC address
Open Systems Interconnection

31. What are the most frequently used options in the IPv4 header?
Loose source routing; Strict source routing; Record route; Timestamp
DSCP (6-bit); ECN (2-bit)
LIRs
Internet Protocol

32. What is ISP?
Time Exceeded
More Fragments follow
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 Service Provider

33. What is the the MF-bit in the IPv4 header?
IANA
Reserved (1-bit); DF (1-bit); MF (1-bit)
More Fragments follow
Open Systems Interconnection

34. What is ICANN?
Reserved (1-bit); DF (1-bit); MF (1-bit)
RIRs
Internet Corporation for Assigned Network Numbers
46

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

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36. What is the ARP Hardware address length value for Ethernet?
Internet Assigned Numbers Authority
255.255.255.252
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
6

37. What are the IP Precedence values?
RFC 791
ICMP Router Discovery Protocol
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Used by IRDP on some operating systems to discover local routers

38. What is the minimum length of an IPv4 header?
Network interface
NIRs
20 octets
192.88.99.0/24

39. What is prefix /29 in decimal notation?
Protocols that don't include subnet masks in their routing updates
Sequence Number
46
255.255.255.248

40. What is prefix /28 in decimal notation?
Each router decrements the TTL
IANA
4
255.255.255.240

41. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Socket
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Reset
Uniquely identify every application in the network

42. What is the format of an IPv4 header?
Protocols that don't include subnet masks in their routing updates
Internet Protocol
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);
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

43. What is ICMP Type 0?
Internet Control Message Protocol
Echo Reply
They are the same byte - but the names and value interpretations are different
NIRs

44. Specifies the format in which subnet masks are displayed in show command output
169.254.0.0/16
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Loose source routing; Strict source routing; Record route; Timestamp
Echo

45. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
Largest segment size that the sender is willing to accept
255.255.255.224
1
IPv4 and IPv6

46. What is prefix /26 in decimal notation?
255.255.255.192
1
Router(config-if)#no ip proxy-arp
Don't Fragment

47. What is the IPv4 Protocol number for IGMP?
60 octets
NIRs
2
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

48. What is RIR?
Regional Internet Registry
8
Sequence Number
3

49. What is the format of an ICMP header?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Internet Corporation for Assigned Network Numbers
Internet Control Message Protocol
2

50. What is the ARP Operation value for a Reverse ARP Request?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
3
Router(config)#ip arp proxy disable
88