Network technology related topics

Large network enterprise network foundation

1. What is? ARP？ARP The role of ？

2. What is? ICMP?

3. Briefly describe the forwarding principle of the switch .

4. Briefly describe the working principle of the router .

5. sketch Trunk The role of .

6. common Cisco What are the simulators ？

7. sketch “ Analog switch module ” and “1 A fast Ethernet interface module ”.

Three layer exchange

1. What is layer 3 switching ？

2. Briefly describe the defects of single arm routing .

3. Briefly describe the forwarding principle of layer 3 switch .

4.Cisco Switch common MLS What are the architectures ？

5. Figure out what is “ Virtual interface ”？

6. What is the command to start the routing function ？

7. Configure an interface on the layer 3 switch as a routing interface （ in other words ： Disable the switch ） What's your order ？

8. What is? DHCP？

9. sketch DHCP Authentication method of relay service .

10. sketch DHCP Precautions for relay configuration .

Spanning tree protocol （STP）

1. Briefly describe the problems of redundant links .

2. What is? STP？

3. sketch STP How it works .

4. What is? “ bridge ”？

5. Spanning tree algorithm （STA） Which three steps can be classified ？

6. How to select the root bridge ？

7. How to select the root port ？

8. How to select the specified port ？

9. Figure Bridge ID The composition of .

10. Figure port ID The composition of .

11. What is? BPDU？

12.BPDU What are the key fields ？

13. What do you mean “STP convergence ”？

14. Use a table to list five types of switch ports “STP Status and use ”.

15. Briefly describe three timing methods of spanning tree timer , And write the default time .

16. Spanning tree and VLAN What are the main relationships between ？

Hot backup routing protocol （HSRP）

1. What is? HSRP？

2. sketch HSRP Who are the group members of , And explain the functions of each group member .

3. sketch HSRP How it works .

4. Icon “ fictitious MAC Address structure （ Mark the bytes of each segment , common 6 byte ）”.

5. HSRP The configured router has six states , Namely ？

6. sketch HSRP Two kinds of timers , And mark the time .

7. sketch HSRP And VRRP The difference between （ Write at least three points ）.

8. sketch “ preempt ” The role of .

9. sketch “ Port tracking ” The role of .

IP Subnet partition

1. sketch “IP Address ” What are the two parts .

2. Briefly describe the principle of subnet division .

3. Application of subnet division —— The formula ：

① Number of subnets ：

② Host number ：

③ Number of available hosts ：

1. Briefly describe what is “ soft ” The rules .

2. Briefly describe what is “ hard ” The rules .

3. sketch IP Four principles that address planning mainly follows .

Access control list （ One ）

1. Briefly describe what is TCP？ What is? UDP？（ And explain the differences ）

2.

3. Icon “TCP Three handshakes ” And “TCP Four times （ Wave ） hand ”.

4. Use a table to list commonly used TCP Port and its description .

5. Use a table to list commonly used UDP Port and its description .

6. What is? ACL？

7. common ACL What are the three types ？（ Explain and write the list number range ）

8. Icon ACL The inspection conditions of （ in other words “ACL Five elements of ”）.

9. sketch ACL Application direction of .

Access control list （ Two ）

1. Brief description of standards ACL And expansion ACL The difference between .

2. Write to see ACL Orders for information .

Network address translation （NAT）

1. What is? NAT？

2. NAT What are the ways to implement ？

3. sketch NAT The advantages of .

4. sketch NAT The shortcomings of .

5. sketch PAT The advantages of .

6. Write to see NAT Commands for converting entries .