Network+ Final Exam

 


The OSI reference model has seven layers:

Application

Presentation

Session

Transport

Network

Data Link

Physical

 

The DoD model has four layers:

Process/Application

Host-to-Host

Internetwork

Network Access

 

 

1. Ethernet works at which layer in the OSI/DoD models


a. Network/Internetwork

b. Network/Network Access

C. Data Link/Network Access

d. Physical/Network Access


 

2. What are the standard network masks for

 

Class A Networks: 255.0.0.0

Class B Networks: 255.255.0.0

Class C Networks: 255.255.255.0

 

3. A T1 line operates at


a. 64 kbps

b. 128 kbps

c. 512 kbps

d. 1024 kbps

E. 1544 kbps

f. 6312 kbps

g. 44736 kbps

h. 274176 kbps


 

4. To connect two switches together you use which kind of cable (choose all that apply)


a. Coaxial RG-58

b. Patch cable

C. Crossover cable

d. Single fiber-optic cable

E. A pair of fiber-optic cables (optional)


 

 

5. On a LAN the user data in a file transfer frame will be encapsulated in the following headers and trailers:

4. Data

1. Ethernet

5. Frame Check Sequence (FCS)

2. IP header

3. TCP header

Including the data, place a number a number between 1 and 5 after each item to indicate its order on the wire.

 

A schematic of a TCP/IP packet enclosed in an Ethernet frame

 

Ethernet Header

IP Header

TCP Header

User Data

Frame Check Seq.

 

 

6. What is the Ethernet broadcast address? FF-FF-FF-FF-FF-FF

 

7. What function does the ARP protocol serve:


a. Resolve FQDNs from IP addresses

b. Resolve IP addresses from MAC addresses

C. Resolve MAC addresses from IP addresses

d. Resolve IP addresses from FQDNs


 

8. How many bytes are used for a MAC address? 6 bytes (48 bits). 3 bytes for vendor ID and 3 bytes for user/NIC ID

 

9. What function does DNS perform in the TCP/IP network


a. Resolve FQDNs from IP addresses

b. Resolve IP addresses from MAC addresses

c. Resolve MAC addresses from IP addresses

D. Resolve IP addresses from FQDNs


 

10. How many bytes are in an IP address (v. 4)? 4 bytes/32 bits

 

11. What class is the address 192.218.65.21? Class C (192.0.0.0 223.255.255.0)

 

12. What class is the address 191.218.65.21? Class B (128.0.0.0 191.255.0.0)

 

13. LDAP uses the port 389 as a standard service port. If you wish to initiate a connection to an LDAP server which port will your client insert this number into:

a. Source port

B. Destination port

 

14. When the server replies it will place 389 in which port:

A. Source port

b. Destination port

 

15. DHCP can manage which of the following (choose all that apply):


A. IP address

B. Router addresses

C. Domain names

D. WINS servers

e. Printers the client will use

f. All f the above


 

DHCP can assign IP addresses to print servers but it cannot manage the printers

 

16. Which protocol is used in dial-up internet accounts


a. PPOE

B. PPP

c. PPTP

d. SLIP

e. CSLIP (Compressed SLIP)


 

17. What are the channels in an ISDN BRI (Basic Rate Interface)? 2B (bearer) + 1D (delta)

 

18. What are their transmission speeds? B = 64 kbps/D = 16 kbps

 

19. Asymmetric encryption is characterized as


a. Secure and fast

B. Secure and slow

c. Using a shared secret key

D. Using a public key and a private key

E. The method of establishing an SSL connection


 

20. A Proxy Server will perform Network Address Translation

A. True b. False

 

21. A hash function reversibly converts the contents of file or data string into a number:

a. True B. False

 

A hash function is irreversible

 

22. Microsoft user level security uses a centralized database of account names and passwords

A. True b. False

 

23. A VPN connection across the Internet tunnel must be terminated by Public Internet Addresses

A. True b. False

 

Every Internet connection must terminate in a Public Internet Address

 

24. RFC 1918 defines sets of private IP addresses. They are (choose all that apply):


a. 10.0.0.0/255.255.0.0

B. 10.0.0.0/255.0.0.0

c. 172.16.0.0/255.255.0.0

D. 172.16.0.0/255.240.0.0

E. 192.169.0.0/255.255.0.0

f. 192.169.0.0/255.255.255.0


25. Microsoft has registered the APIPA address range. What must an Internet router do if it encounters an address in the APIPA or RFC 1918 range? Discard it

 

26. The address mask determines whether two hosts will appear on the same network. Are the following two machines on the same network:

a. 172.18.16.32/255.255.255.0

b. 172.18.17.33/255.255.255.0 No, they are on 172.18.16.0 and 172.18.17.0, respectively

 

27. How do hosts on different networks communicate? Routers

 

28. What does Ping 10.24.13.14 test? Basic TCP/IP network connectivity

 

29. What does Ping Tech09 test? TCP/IP network connectivity using name resolution (DNS or WINS)

 

30. The output of TRACERT shows: 109.23.44.15 id.nobody.com 10 MS 10 MS 11 MS. What does it signify?

 

It shows that traffic to a host passed through a router (hop) in the domain id.nobody.com with a time to reach it of about 10 milliseconds. Generally it shows a hop on the way to the target, which is the minimum answer required.