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Cisco Network Fundamentals - 2

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. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Gateway
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DNS - video-streaming - VoIP

2. What is a broadcast domain?
TCP. It makes larger demands on a network
It Doesn't - TCP does
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
UDP - it sends datagrams as 'best effort'

3. What is the port range for well known ports
Window size
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Maximum transmission unit
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

4. Are well known ports registered
User Datagram Protocol
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Packet
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

5. What two commands can be used to view a host's routing table?
Window size
Web browsing - email - file transfer
POP3
Netstat -r and route print

6. Ephermeral port is what type of port
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.
Dynamic / private
It is used by both routers and hosts. The second one is incorrect because IP uses addressing information in the header to determine the best path for the packet. 'Reliable' is incorrect because IP is only a 'best effort' protocol
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7. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Reliable - connection-oriented protocol (resends if not received)
False. It's like a file - only one process can read/write.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

8. How does UDP keep track of sequence numbers?

9. What is the port range for Registered ports
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction
TFTP - Trivial File Transfer Protocol
TCP uses flow control
The default gateway address is the address of a router interface that is connected to the same network as the host.

10. Pieces of information about a route that a routing table contains
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
All
DNS - video-streaming - VoIP
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

11. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
Routers (the subnetting process)
TCP. It makes larger demands on a network
UDP - it sends datagrams as 'best effort'

12. Port 25 is?
UDP
SMTP
It is the most common - and it encapsulates transport layer segments
Ephermeral

13. Port 69 is?
Static routing
Decapsulation
All
TFTP - Trivial File Transfer Protocol

14. In networking terms - What is reliability?
It means ensuring that each segment that the source sends arrives at the destination
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
FIN
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

15. What is contained in the header of each segment or datagram?
Maximum transmission unit
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
It is the most common - and it encapsulates transport layer segments
The source and destination port number

16. What information does a router need to successfully forward packets?
User Datagram Protocol
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
The source and destination port number
Destination network - next-hop - metric

17. Which of the following are true about static and dynamic routing?
TCP uses flow control
Acknowledgment and reassembly (receipt of packets and putting them in right order)
128
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

18. What is the netstat utility used for on a host?
Routers (the subnetting process)
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th
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Gateway

19. MTU stands for ?
Maximum transmission unit
Acknowledgment and reassembly (receipt of packets and putting them in right order)
UDP
Purpose - ownership - and geographic location are key ways to divide a network

20. What are three key factors to consider when grouping hosts into a common network?
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Purpose - ownership - and geographic location are key ways to divide a network
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.
Acknowledgment field significant

21. List three network applications that use TCP
The default gateway address is the address of a router interface that is connected to the same network as the host.
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p
Web browsing - email - file transfer
Static routing

22. Which protocol provides just the basic functions for efficiently delivering data pieces between appropriate applications - TCP or UDP?

23. What is the default DNS port number?
Ephermeral
HTTPS (Secure HTTP)
53
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

24. End systems use port numbers to select the proper application. What is the lowest port number that can be dynamically assigned by the host system? 1 - 128 - 256 or 1024?
Data link - physical
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
An alternate HTTP port
Purpose - ownership - and geographic location are key ways to divide a network

25. Which of the following are true about TCP and IP?

26. What is the proper order of FIN sequence?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Packet
TCP uses flow control
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

27. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
32 - there are four octets of 8 bits each in an IPv4 address
Maximum transmission unit
SMTP

28. UDP does or does not create a session?
It is the most common - and it encapsulates transport layer segments
20 and 8
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Does not

29. Port 8080 is?
Allows the transport layer function on the destination host to reassemble segments in the right order
Window size
128
An alternate HTTP port

30. Which protocol ensures more reliable delivery between applications - TCP or UDP?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
To track the different conversations crossing the network at the same time
TCP uses flow control
TCP. It makes larger demands on a network

31. Ports can be shared at the same time? (t/f)

32. Routers add routes for the connected networks to their ________________ .
The source and destination port number
Routing table
Upper
Connectionless - Best effort (unreliable) - media independent

33. On a particular network how would you determine the default gateway address for a host?
Gateway
Transport
TCP
The default gateway address is the address of a router interface that is connected to the same network as the host.

34. Why is IP 'media independent'?
Ephermeral
1
It works the same on all Layer 1 media
UDP - it sends datagrams as 'best effort'

35. Which of the following are true about network layer encapsulation?
False. It's like a file - only one process can read/write.
Netstat -r and route print
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Static routing

36. Which of the following are true about IP?
It is the most common - and it encapsulates transport layer segments
Data link - physical
Destination network - next-hop - metric
Acknowledgment and reassembly (receipt of packets and putting them in right order)

37. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Connectionless - Best effort (unreliable) - media independent
Web browsing - email - file transfer
Dynamic / private

38. TCP header provides for
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
All
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port
It works the same on all Layer 1 media

39. What is the protocol number for UDP?
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10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
Connectionless
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

40. MSN messenger uses TCP or UDP?
TCP
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Synchronize sequence numbers
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

41. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Packet
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
It Doesn't - TCP does

42. What is the purpose of the ToS field in the IPv4 header?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
Does not
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route

43. IP is designed or not designed to track and manage the flow of packets?
Gateway
Static routing
Dynamic / private
Not - these are done by other protocols in other layers

44. Routes to remote networks with the associated next-hops can be manually configured on the router. What is the same for this type of routing?
Upper
Data link - physical
Static routing
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

45. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p
49152 - 65535.
Reliable - connection-oriented protocol (resends if not received)

46. What is the port range for dynamic or private ports
49152 - 65535.
Telnet
HTTPS (Secure HTTP)
32 - there are four octets of 8 bits each in an IPv4 address

47. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
53

48. How many bits are in an IPv4 address?
UDP - it sends datagrams as 'best effort'
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
32 - there are four octets of 8 bits each in an IPv4 address
Acknowledgment field significant

49. Port 194 is?
IRC
UDP - it sends datagrams as 'best effort'
Upper
Web browsing - email - file transfer

50. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
TCP uses flow control
Routers (the subnetting process)
Packet
Purpose - ownership - and geographic location are key ways to divide a network