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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 prefix /30 in decimal notation?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Used by IRDP on some operating systems to discover local routers
2
255.255.255.252

2. What are the most common IP version numbers?
Electrical/Optical - Mechanical - Functional and Procedural
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
IPv4 and IPv6
0.0.0.0/8

3. What is URG?
2
Mostly large ISPs - enterprises - or academic institutions
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Urgent

4. What is the ARP Operation value for an Inverse ARP Reply?
Redirect
20 octets
9
1

5. Who group public IPv4 address space by major geographic region?
National Internet Registry
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Data Offset
ICANN and IANA

6. What is the ARP Hardware address length value for Ethernet?
6
Both the TCP header and the encapsulated data
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
Router(config-if)#arp timeout {seconds}

7. What is ARP?
1
Address Resolution Protocol
RFC 791
Network interface

8. Which RFC defines the private IPv4 address ranges?
Protocols that don't include subnet masks in their routing updates
255.255.255.192
RFC 1918
The next sequence number that the source expects to receive from the destination

9. What is SYN?
Echo
Synchronize
Length of header in words (32-bit)
4

10. What is ECE?
Local Internet Registry
47
Sequence Number + Data payload octets + 1
ECN-Echo

11. Disables proxy ARP on all interfaces
Socket
Windowing
Router Selection
Router(config)#ip arp proxy disable

12. What are the uses of gratuitous ARP?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Sequence Number + Data payload octets + 1
Push
88

13. What is the format of an IPv4 header?
ECN-Echo
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Internet Service Provider
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);

14. What are the IP Precedence values?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Echo
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Maximum Segment Size (MSS)

15. What is CWR?
All Internet Registries
Network interface
Congestion Window Reduced
Windowing

16. What is ICMP Type 0?
192.0.2.0/24
Subtract Header Length field from Total Length field
Echo Reply
Router(config)#ip arp proxy disable

17. What is the format of the ToS byte in the IPv4 header?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Used by IRDP on some operating systems to discover local routers
DHCP
Internet Protocol

18. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
198.18.0.0/15
Application
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
47

19. What are the steps to subnet an IPv4 address?
LIRs
6
198.18.0.0/15
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

20. What is the IPv4 Protocol number for OSPF?
Synchronize
89
0
Internet

21. What is the format of the ToS field?
Uniquely identify every application in the network
Identifier; Flags and Fragmentation Offset
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Push

22. What is the format of a UDP header?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
ICANN
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
192.0.2.0/24

23. What is ICMP Type 5?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
20 octets
Redirect
An ARP request issued by a host with its own IPv4 address as the target address

24. Which IPv4 address range is reserved for loopback testing?
Acknowledgements - checksums and timers
127.0.0.0/8
255.255.255.240
Router(config-if)#no ip proxy-arp

25. Disables proxy ARP on an interface
The next sequence number that the source expects to receive from the destination
Electrical/Optical - Mechanical - Functional and Procedural
88
Router(config-if)#no ip proxy-arp

26. Specifies the format in which subnet masks are displayed in show command output
Acknowledgement
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Uniquely identify every application in the network
Per-Hop Behaviour (PHB)

27. What is the IPv4 Protocol number for IGMP?
Transmission Control Protocol
2
An ARP request issued by a host with its own IPv4 address as the target address
Internet Service Provider

28. What is added after the option field in the IPv4 header?
192.88.99.0/24
Padding of zeros to ensure that the header ends on a 32-bit boundary
Echo Reply
Electrical/Optical - Mechanical - Functional and Procedural

29. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
255.255.255.128
National Internet Registry
169.254.0.0/16
Echo Reply

30. What is the ARP Operation value for an ARP Request?
1
Router#clear arp-cache [{interface {interface}} | {ip-address}]
9
RIRs

31. What is the ARP Operation value for a Reverse ARP Reply?
4
Router#clear arp-cache [{interface {interface}} | {ip-address}]
47
Local Internet Registry

32. What is TCP?
Congestion Window Reduced
Transmission Control Protocol
Sequence Number
Sequence Number + Data payload octets + 1

33. What is the format of an ICMP header?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Internet Control Message Protocol
Sequence Number + Data payload octets + 1
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

34. What is the IPv4 Protocol number for ICMP?
Internet Assigned Numbers Authority
Internet Corporation for Assigned Network Numbers
1
4

35. What is prefix /26 in decimal notation?
255.255.255.192
Used by a host to obtain the IPv4 address associated with its own MAC address
DSCP (6-bit); ECN (2-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)

36. What is the first octet rule for IPv4 address classes in binary?
Urgent
They are the same byte - but the names and value interpretations are different
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
The next sequence number that the source expects to receive from the destination

37. What is IP?
Acknowledgement
64
Internet Protocol
Used by a host to obtain the IP address associated with another host's MAC address

38. What is prefix /28 in decimal notation?
Echo
192.88.99.0/24
255.255.255.128
255.255.255.240

39. What is Inverse ARP?

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40. Who allocates public IP address ranges to NIRs or LIRs?
Each router decrements the TTL
Electrical/Optical - Mechanical - Functional and Procedural
RIRs
Router Selection

41. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
1
Congestion Window Reduced
Address Resolution Protocol

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

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43. What is covered by the TCP Checksum field?
Network interface
Both the TCP header and the encapsulated data
0
4

44. What is LIR?
Router(config)#arp {ip-address} {mac-address} arpa
Local Internet Registry
Protocols that don't include subnet masks in their routing updates
An ARP request issued by a host with its own IPv4 address as the target address

45. What is the IPv4 Protocol number for IP in IP encapsulation?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
4
Time to Live
Internet

46. What is proxy ARP?
Reset
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
IANA

47. What is ISP?
National Internet Registry
4
Internet Service Provider
0

48. Who assigns IP address space to its own customers?
Urgent
RFC 3330
Windowing
LIRs

49. Who can assign IP address space to end user organizations?
3
255.255.255.192
Used by IRDP on some operating systems to discover local routers
All Internet Registries

50. What are classful routing protocols?

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