Participated in the preliminaries of the Xinhua Three Cups and the National Finals of the Xinhua Three Cups, and shared some questions encountered in the preliminary competitions. The answers are personal choices and are for reference only
The preliminary score is 820+150 (certificate bonus points) a total of 970 points
1. Which of the following RAID levels has no data protection function ()
A.RAID5
B.RAID1
C.RAID6
D.RAID0
2. The correct description of the technical characteristics of ZigBee is ()
A. Provide data integrity check and authentication function, using AES-128 encryption algorithm
B. Large capacity, currently a single network can actually access 65535 nodes
C. Data rate can reach 100Kbps-2500Kbps
D. Communication distance is about 1-20 rice
3. The following are not wireless communication protocols:
AM-bus
B.NB-IoT
C.NFC
D.Bluetooth
4. Which of the following are the port states of STP?
A.Forwarding
B.Listening
C.Blocking
D.Waiting
E.Learning
F.Disable
4. Which of the following elements can NAPT convert?
A. Protocol number
B. Port number
C. MAC address
D. IP address
5. Which of the following protocols belong to the network interface layer protocol?
A.PPP
B.Ethernet
C.SMTP
D.HDLC
6. Which of the following layers does the TCP/IP protocol stack include?
A. Application layer
B. Transport layer
C. Network layer
D. Presentation layer
E. Network interface layer
7. In link aggregation, if a member port G1/0/1 in a dynamic aggregation group is not selected, the possible reasons are: A. The VLAN
attribute configuration of the port is inconsistent with the reference port
B. The port is configured MSTP
C. The port has joined the isolation group, which is inconsistent with the reference port
D. The port rate is inconsistent with the reference port
8. Among the following types of LSA, A.Type4 LSA
B.Type3 LSA C.Type1 LSA D.Type7 LSA may be generated by ASBR
9. The two routers cannot establish an OSPF neighbor relationship. The possible reasons are:
A. By configuring silent-interface, the adjacent interfaces of the two routers do not send protocol packets.
B. The Router IDs
of the two routers conflict
. The configured authentication passwords are inconsistent
10. Loops in the LAN may cause
A. Port duplex mode changes
B. Port rate changes
C. Broadcast storm
D. MAC address learning error
11. The following statements about ARP packets are correct:
A. ARP request packets are sent by broadcast
B. ARP response packets are sent by unicast
C. ARP packets cannot be forwarded to other broadcast domains
D. ARP request packets The target MAC address in the text is a MAC address with all 1s
12. Which of the following IEEE 80211 PHY layer protocols can work in the 24G and 5G frequency bands at the same time?
A.802.11n
B.802.11g
C.802.11ax
D.802.11ac
13. Common security threats on the Internet include ().
A. Various protocol vulnerability attacks
B. Illegal resource access
C. Unauthorized resource access
D. Resource sharing
14. What measures can be taken for active attacks to ensure the normal operation of the business?
A. Data source verification
B. Data encryption
C. Anti-rejection attack technology
D. Integrity verification
15. Which of the following options are common security risks at the transport layer?
A. Smurf attack
B. TCP spoofing
C. ICMP attack
D. Port scanning
16. Which of the following functions does a firewall in Layer 2 mode support?
A. Security policy
B. Network address translation
C. ASPF state filtering
D. Attack defense
17. Which of the following attacks are DoS/DDoS attacks?
A. Smurf attack
B. Port scanning
C. SYN Flood attack
D. Teardrop attack
18. Which of the following belongs to the session synchronization method of firewall dual-system hot backup?
A. Real-time backup
B. Batch backup
C. Incremental backup
D. Periodic backup
19. Which of the following are cloud computing PaaS services?
A. Middleware & runtime
B. Database
C. Data & information
D. Application software
20. Which RAID levels are the disk space utilization rate fixed at 50%?
A.RAID6
B.RAID5
C.RAID1
D.RAID10