1, what is the difference between a star topology diagram and a network topology?
Star topology: Easy to implement, easy to expand, easy to troubleshoot, but the central node pressure, high network costs, nodes and central node directly connected
Mesh topology: Opposite to star topology
2, briefly ieee802.3u, ieee802.3z standard
IEEE802.3U:100M/S Fast Ethernet Standard
IEEE802.3Z: 1gb/s Ethernet standard for Fiber media
3, Binary conversion: 1 2 4 8 16 32 64 128 512 1024
What are the seven layers of the 4,osi reference model?
Application layer, presentation layer, session layer, Transport layer, network layer, data link layer, physical layer
5, which layer is the data frame?
Data Link Layer
6, which layer does the router work on?
Network layer
7, the next three-layer package process:
The application layer is transformed into binary encoded data, the data segment is transferred to the head of the TCP packet, the transport layer plus the IP, the Data Link layer Home Mac Head, the physical layer turns the bit into an electrical signal.
8,T568A,T568B's line order?
A: White green, green, white orange, blue, white blue, green, white brown, brown
B: White orange, orange, white green, blue, white blue, green, white brown, brown
9, what are the six subsystems of the cabling system?
1), Workspace subsystem 2), level subsystem 3), management subsystem
4), vertical subsystem 5), building subsystem 6), inter-device subsystem
10, material estimate n information points
Crystal Head: 4n+4n
15%
Cable usage: c={0.55(L+s) +6}
N
module = information + information points3%
11, cabling facility Process
1), Wall Punch 2), cable slot installation 3), cabling
4), end cable 5), device shelves 6), connectivity test
What are the switch configuration modes for 12,cisco?
1), user mode 2), privileged mode
3), global configuration Mode 4), interface mode
13, how does the switch work?
1), MAC address learning 2), broadcast location data frame
3), receiver response information
4), the switch implements unicast communication
14, interface dual attack, rate mismatch results
1), interface Duplex: Mismatch will appear drop packet phenomenon
2), rate: mismatch will directly break the net
15, which network segments are included in the private URL?
1), a:10.0.0.0-10.255.255.255
2), b:172.16.0.0-172.31.255.255
3), c:192.168.0.0-192.168.255.255
16. View the Router interface status commands
SH IP Brief
The role of the 17,ARP protocol?
Resolve IP address to MAC address
18,arp working principle: Through the target device's IP address, query the target device's MAC address, to ensure the smooth communication
Ping-t Wireless Ping
20,arp-a viewing the ARP cache table
21, Route formation: 1), by manual configuration
2), automatic learning by running dynamic routing protocol
22, what is routing?
When the IP address is configured on the router interface and the interface status is up, the network segment where the interface resides
23, what are the characteristics of static routes and default routes?
Static routes: Fixed routes that are manually configured
Default route: is a special kind of static route
24, default route: 0.0.0.0 0.0.0.0 represents all networks
25, very complex technology is: the different signals are intertwined with each other in different time periods, along the same channel transmission technology
26, common WAN access mode?
Traditional dial-up ADSL wireless Mode optical fiber mode
Cable Modem leased digital circuit
What are the characteristics of 27,ADSL access mode?
High-speed transmission, Internet calls do not interfere, exclusive broadband, safe and reliable, affordable, fast and convenient installation
28, describe the function of ADSL separator?
Separating the HF data signal from the ADSL telephone line from the low frequency voice signal so that they do not interfere with each other and transmit on the same telephone line
The 29,SSID number is: The name of the WLAN is identified, is the most basic identity mechanism of wireless network
30, China's 3G operators and standards?
1), Unicom: WCDMA
2), Mobile: TD-SCDMA
3), Telecom: CDMA2000
31, what are the mainstream 4G technologies?
1), lte-advanced
2), Wireless man-advanced
31, what are the security settings for wireless APs?
(1), change the default user name password
(2), shielded SSID broadcast
(3), set the user secret key
(4), Bind MAC address
32, what is the memory type of the router?
RAM ROM Flash NVRAM
33, describe the Cisco routing product system?
1), branch company several
2), the WAN will gather
3), service provider level
34,cisco device iOS naming
1), the hardware platform that the Aaaaa:ios applies To
2), Bbbb:ios contains the feature set
3), Cc:ios software operating mode and compression format
4), Dddd:ios software level
5), suffix of ee:ios file
35. How do I set up a Cisco device to use FTP on iOS again?
Configure the FTP server to configure the FTP user name and password on the Cisco device, and then (Copy flash FTP)
How the 36,ARP grouping is encapsulated/
ARP grouping at the data link layer
37,arp the principle of attack and deception: sending a fake MAC address to the target host
Attack: Network does not communicate properly
Spoofing: Intercepting Information
38,trunk function: Is the same VLAN capable of communicating, converting, VLAN tagging across switches
39, what is the role of VLAN and VLAN?
1), dividing the broadcast domain on the switch is VLAN
2), a large network is divided into a number of small virtual LANs
40, the switch's access interface can belong to 1 VLANs
41, describe the difference between the access link and the relay link?
Access: Usually belongs to a VLAN, used to connect computers
Trunking: Can host multiple valn, connections between switches
Cisco Knowledge points for Network technology
