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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 ECE?
Local Internet Registry
Router(config-if)#no ip proxy-arp
ECN-Echo
All Internet Registries

2. Which RFC defines the private IPv4 address ranges?
RFC 1918
Application
46
Uniquely identify every application in the network

3. What is proxy ARP?
Protocols that don't include subnet masks in their routing updates
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
17
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

4. What is the format of an IPv4 header?
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);
They are the same byte - but the names and value interpretations are different
255.255.255.240
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

5. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Host-to-host
Echo
Time to Live
Network interface

6. Displays the ARP cache of a router
Internet Corporation for Assigned Network Numbers
Router#show arp
Mostly large ISPs - enterprises - or academic institutions
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

7. What is the IPv4 Protocol number of RSVP?
Router(config)#ip arp proxy disable
46
127.0.0.0/8
Largest segment size that the sender is willing to accept

8. What is the IPv4 Protocol number for TCP?
ICANN and IANA
198.18.0.0/15
Maximum Segment Size (MSS)
6

9. What is IP?
Echo
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
88
Internet Protocol

10. 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
All Internet Registries
Router(config-if)#arp timeout {seconds}
Each router decrements the TTL

11. What is the Fragment Offset field in the IPv4 header?
Per-Hop Behaviour (PHB)
46
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Acknowledgements - checksums and timers

12. What is the value of the TCP Reserved field?
4
192.88.99.0/24
Sequence Number + Data payload octets + 1
0

13. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Local Internet Registry
Reset
Router(config-if)#arp timeout {seconds}

14. What are the most frequently used options in the IPv4 header?
Windowing
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
4
Loose source routing; Strict source routing; Record route; Timestamp

15. What is FIN?
IANA
Final
192.88.99.0/24
DHCP

16. What is prefix /30 in decimal notation?
Router Advertisement
Protocols that don't include subnet masks in their routing updates
255.255.255.252
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

17. What is the ARP Operation value for a Reverse ARP Request?
3
RFC 1918
Internet Service Provider
LIRs

18. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Electrical/Optical - Mechanical - Functional and Procedural
Synchronize

19. What is ICMP?
The next sequence number that the source expects to receive from the destination
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Internet Control Message Protocol
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

20. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
4
192.88.99.0/24
Router Advertisement
Address Resolution Protocol

21. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
ICANN
Push
Socket
LIRs

22. Specifies the format in which subnet masks are displayed in show command output
Both the TCP header and the encapsulated data
Urgent
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Host-to-host

23. What is the function of ICMP redirect messages?
Internet Corporation for Assigned Network Numbers
1
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

24. What is the content of the TCP Window Size field?
Congestion Window Reduced
Windowing
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
RIPv1 and IGRP

25. What is RIR?
47
The next sequence number that the source expects to receive from the destination
Regional Internet Registry
Application

26. What is the format of the DiffServ byte?
9
IPv4 and IPv6
Final
DSCP (6-bit); ECN (2-bit)

27. What is prefix /26 in decimal notation?
4
The next sequence number that the source expects to receive from the destination
Windowing
255.255.255.192

28. What is the ARP Operation value for an ARP Request?
Protocols that include subnet masks in their routing updates
1
Transmission Control Protocol
2

29. What is Reverse ARP?
Internet Protocol
Internet Corporation for Assigned Network Numbers
Used by a host to obtain the IPv4 address associated with its own MAC address
6

30. Which IPv4 address range is reserved for loopback testing?
127.0.0.0/8
Padding of zeros to ensure that the header ends on a 32-bit boundary
0.0.0.0/8
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

31. What is CWR?
Host-to-host
Congestion Window Reduced
Regional Internet Registry
Time Exceeded

32. What are the uses of gratuitous ARP?
National Internet Registry
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Push
9

33. What is the IPv4 Protocol number for ICMP?
4
NIRs
1
Length of header in words (32-bit)

34. What is prefix /27 in decimal notation?
IANA
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
255.255.255.224
3

35. What is the function of ICMP router advertisement and router selection messages?
Router(config)#ip arp proxy disable
Used by IRDP on some operating systems to discover local routers
255.255.255.248
Final

36. What is the IPv4 Protocol number for IGMP?
ICMP Router Discovery Protocol
0x0800
2
Internet Service Provider

37. What is Inverse ARP?

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38. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
Push
Sequence Number
47
An ARP request issued by a host with its own IPv4 address as the target address

39. What is ICMP Type 0?
NIRs
Identifier; Flags and Fragmentation Offset
Open Systems Interconnection
Echo Reply

40. What are the protocol categories that describe the physical layer?
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
Final
Electrical/Optical - Mechanical - Functional and Procedural
Don't Fragment

41. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Socket
64
Length of header in words (32-bit)
Router Selection

42. Why must the header checksum of an IPv4 packet be recalculated at every router?
Each router decrements the TTL
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Padding of zeros to ensure that the header ends on a 32-bit boundary
1

43. Who are LIRs?
Mostly large ISPs - enterprises - or academic institutions
255.255.255.248
1
Sequence Numbers

44. What is PSH?
Push
4
1
Time Exceeded

45. What mechanism is used by TCP to regulate the flow of segments?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Router(config)#ip arp proxy disable
Windowing
Host-to-host

46. What is ISP?
Internet Service Provider
ICMP Router Discovery Protocol
Router(config-if)#arp timeout {seconds}
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);

47. Adds a permanent static ARP entry for an Ethernet host
Router(config)#arp {ip-address} {mac-address} arpa
RIRs
Internet Service Provider
Padding of zeros to ensure that the header ends on a 32-bit boundary

48. What is the IPv4 Protocol number for GRE?
47
255.255.255.240
Padding of zeros to ensure that the header ends on a 32-bit boundary
Socket

49. Which IPv4 address range is reserved for self-identification on a local subnet?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Regional Internet Registry
IANA
0.0.0.0/8

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