The fastest access speed of the CPU in the computer is the (general purpose register)
computer system CPU, memory, and I/0. Its reliability is 0.9, 0.5, 0.6 , and the computer system reliability is (0.9 0.5 0.6=0.27)
The error in the description of the CPU is that (the program controller pc can also store temporary storage arithmetic/logical results in addition to storing the instruction address. In
the register of the operand, the addressing mode is (register indirect addressing) to
increase the cache between the host and the CPU. The purpose is to (solve the matching speed between the CPU and the memory) in the
description of the one-bit odd parity method, the correct one is that if there is an odd number of data bit errors, the error can be detected but the error cannot be corrected)
System bus cycle 4 Cycles, 8Byte data can be transmitted in each cycle. If the clock frequency of the bus is 1.6GHz, the bandwidth of the bus (transmission rate=clock frequency/each cycle includes the bytes transmitted in each cycle of the clock: 1.6GHz/48=3.2GB/s)
in three systems in series , A system failure rate of 0.1, 6000 hours, the average failure time of the entire system is (failure rate = 0.1 + 0.1 + 0.1 = 0.3, 0.3 increased by 3 times, 6000/3 = 2000),
cyclic redundancy check standard CRC The generator polynomial of -16 is G(x)=x 16+x 15+x^2+1, and the verification code it produces is 16 bits. After the receiving end finds an error, the measure taken by the receiver is (automatically request retransmission)
and other Compared with network security technology, the biggest feature of IDS is that (internal operations cannot be found)
SNMPc supports various device access methods. Among the device access methods supported by SNMPc, the only method used to poll tcp services is (no access mode)
Enter the command in the Windows DNS window:
C/nslookup (you can view the DNS IP)
The role of the set type=ptr
211.151.91.165
command sequence (to query the mapping from 211.1151.91.165 to the domain name) is
the first route under the tracert command as the local gateway.
At the end is the IP address of the local network card.
13. The virtual machine can be a virtual host based on (IP) or a virtual host based on a name.
14. In Windows system, if the administrator needs to start the system console, he can also enter the (MMC) command.
(MMC is a management tool used to manage networks, computers, services and other system components).
15. The ftp.softwaretext.com record in the DNS server is established by means of (alias).
16. If you enter the (regedit) command in the Windows2008 R2 "Run" window, you can view and modify the registry.
17. The administrator wants to use the ping command for scientific research under Windows, ping www.test.com. If the request times out, the reason is impossible (DNS server resolution is unsuccessful)
18. SNMP is under UDP 0.0.0.0:161, and the output means service Already started.
19. If the administrator wants to test the data connectivity of the target 192.168.99.221 for a long time, enter the command (ping 192.168.99.221 -t) in the DNS window. The
administrator wants to test the target 192.168.1.221 at 1500 bytes. For data connectivity in the case of large data packets, enter the command in the DNS window (ping192.168.99.221 -l) (-n: indicates the number of pings)
20. When the network administrator uses the Tracert command to track the path to the website server , It displays *** request timeout as (normal phenomenon)
21. If you want the machine to list the current routing table, the command you can use is (netstat (cannot diagnose NDS faults) -r)
22, (arp -s) is to add a static table entry in ARP.
23, netstat -a displays as shown in the figure.
Protocol IP address: port external address status
24, under Windows =, the -r -x option of the ping command means (record the route of the intermediate hop)
DHCP server under windows (1, wired as 8 days, unlimited for 8 hours. 2 When the lease is 50%, the client will renew the lease with the server. 3. When the lease expires 87.5%, the client and the server fail to contact, and the IP address lease process is restarted. 4 , Use ipconfig/renew to reapply for the address.
5. The administrator uses the (ipconfig/flushdns) command in the Windows command line window to clear the cache.
Tracert can find the router and arrival time of the packet to the target host.
In the Windows command line window Use the (ipconfig/release) command to release the address assigned by the DHCP server.
Enter the nslookup interactive working mode in the Windows command line window, and then access set type=mx, this configuration can (query the address of the mail server)
