Test your basic knowledge |

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. Port 443 is?
TCP uses flow control
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.
HTTPS (Secure HTTP)
Connectionless - Best effort (unreliable) - media independent

2. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
53
HTTPS (Secure HTTP)
It is the most common - and it encapsulates transport layer segments

3. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Upper
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Acknowledgment field significant
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

4. SYN is?
Connectionless
Transport
Synchronize sequence numbers
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

5. 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?
Connectionless
POP3
49152 - 65535.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

6. TCP is a ________________ layer protocol.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Transport
Destination network - next-hop - metric
Not - these are done by other protocols in other layers

7. Which is a connection-oriented protocol - TCP or UDP?
TCP
Telnet
An alternate HTTP port
The default gateway address is the address of a router interface that is connected to the same network as the host.

8. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Connectionless - Best effort (unreliable) - media independent
Routers (the subnetting process)
TCP
POP3

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

10. Are well known ports registered
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
Packet
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
UDP

11. What two commands can be used to view a host's routing table?
20 and 8
Netstat -r and route print
Allows the transport layer function on the destination host to reassemble segments in the right order
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

12. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
49152 - 65535.
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
Packet
The default gateway address is the address of a router interface that is connected to the same network as the host.

13. Which of the following are true about static and dynamic routing?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
IRC
Purpose - ownership - and geographic location are key ways to divide a network
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

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

15. Port 8080 is?
TCP. It makes larger demands on a network
An alternate HTTP port
Decapsulation
49152 - 65535.

16. Which is a connectionless protocol - UDP or TCP?
UDP
TCP
It is the most common - and it encapsulates transport layer segments
Connectionless - Best effort (unreliable) - media independent

17. Ephermeral port is what type of port
Dynamic / private
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

18. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Purpose - ownership - and geographic location are key ways to divide a network
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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
Static routing

19. List three network applications that use UDP
Routing table
An alternate HTTP port
It means ensuring that each segment that the source sends arrives at the destination
DNS - video-streaming - VoIP

20. What is the purpose of sequence numbers?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Decapsulation
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
Allows the transport layer function on the destination host to reassemble segments in the right order

21. What is the purpose of the ToS field in the IPv4 header?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
It means ensuring that each segment that the source sends arrives at the destination
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.
Reliable - connection-oriented protocol (resends if not received)

22. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
TCP
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Data link - physical
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

23. What is a broadcast domain?
User Datagram Protocol
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Connectionless
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

24. The three-way handshake performs what three functions?
SMTP
Not - these are done by other protocols in other layers
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.
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

25. What kinds of problems are caused by excessive broadcast traffic on a network segment?
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
It means ensuring that each segment that the source sends arrives at the destination
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

26. Which of the following are true about network layer encapsulation?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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.
Purpose - ownership - and geographic location are key ways to divide a network
Not - these are done by other protocols in other layers

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

28. IP is designed or not designed to track and manage the flow of packets?
Not - these are done by other protocols in other layers
Dynamic / private
All
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da

29. What is the port range for dynamic or private ports
It Doesn't - TCP does
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
49152 - 65535.
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

30. What are three key factors to consider when grouping hosts into a common network?
Purpose - ownership - and geographic location are key ways to divide a network
Web browsing - email - file transfer
Acknowledgment and reassembly (receipt of packets and putting them in right order)
It Doesn't - TCP does

31. At the transport layer - which of the following controls is used to keep a transmitting host from overflowing the buffers of a receiving host? Choose one: Best effort - encryption - flow control - congestion avoidance?
Acknowledgment field significant
TCP uses flow control
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
128

32. Routers add routes for the connected networks to their ________________ .
It Doesn't - TCP does
Web browsing - email - file transfer
Routing table
FIN

33. TCP header provides for
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Window size
Telnet

34. The three main features of routes in a routing table are?
Does not
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Destination network - next-hop - metric
Synchronize sequence numbers

35. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Purpose - ownership - and geographic location are key ways to divide a network
Routers (the subnetting process)
20 and 8
HTTPS (Secure HTTP)

36. 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?
Static routing
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
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
Ephermeral

37. List three network applications that use TCP
Web browsing - email - file transfer
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Reliable - connection-oriented protocol (resends if not received)
Transport

38. What is the default DNS port number?
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
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
53
Upper

39. Which protocol ensures more reliable delivery between applications - TCP or UDP?
HTTPS (Secure HTTP)
POP3
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
TCP. It makes larger demands on a network

40. Port 20 is?
SMTP
The source and destination port number
Routers (the subnetting process)
FTP

41. Name the private address blocks
It is the most common - and it encapsulates transport layer segments
Destination network - next-hop - metric
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
Not - these are done by other protocols in other layers

42. What is the purpose of TCP/UDP port numbers?
To track the different conversations crossing the network at the same time
SMTP
TCP uses flow control
Packet

43. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
False. It's like a file - only one process can read/write.
1
Acknowledgment field significant
Window size

44. Port 110 is?
The default gateway address is the address of a router interface that is connected to the same network as the host.
49152 - 65535.
1
POP3

45. How does UDP keep track of sequence numbers?

46. What is the port range for Registered ports
Not - these are done by other protocols in other layers
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
Allows the transport layer function on the destination host to reassemble segments in the right order
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

47. IP requires that each sending and receiving device have a __________ IP address.
Routing table
Unique
Dynamic / private
It works the same on all Layer 1 media

48. MSN messenger uses TCP or UDP?
TCP
Netstat -r and route print
128
Gateway

49. What four tasks does the network layer perform?
Dynamic / private
It is the most common - and it encapsulates transport layer segments
Static routing
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

50. When the client end of the session has no more data to transfer - it sets the ___________ flag in the header of the segment? (Hint: three-letter acronym)
Routing table
An alternate HTTP port
FIN
Routers (the subnetting process)