Some cisco switch modules organize the TwinGig Converter Module of the Catalyst 3750-E Series Switch: www.2cto.com TwinGig SFP converter can convert the 10 thousand M Ethernet X2 interface into two Gigabit Ethernet Small pluggable (SFP) ports. XENPAK uplink modules of Catalyst 3750G series switches: common optical modules of Ethernet switches include SFP, GBIC, XFP, and XENPAK, respectively: www.2cto.com SFP: Small Form-factor Pluggable
, we have placed the annett Network Management Switch AT-8024 in the office area, connecting to our core switch Cisco 6509 via optical fiber and optical transceiver in the middle Cisco 6509 is configured as: super engine SUP720, a 16-port Gigabit Optical module WS-X6816-GBIC, A 48-port fast switching electrical module WS-X6548-RJ-45 ).
Trunk is set up on the corresponding port connecting the optical transce
-port Gigabit Optical Module Ws-x6816-gbic, a 48-port fast switching module ws-x6548-rj-45). Trunk on the corresponding port of the 6509 and Annette Switch connected to the optical transceiver, the Annette switch is divided into two VLANs, respectively 172.25.6.0/24 (hereinafter referred to as VLAN6) and 172.25.7.0/24 (hereinafter referred to as VLAN7), The machines of the two departments are connected to t
When the number of ports that a single switch can provide is insufficient to meet the requirements of the network computer, more than two switches must provide the corresponding number of ports, which also involves the connection between switches. Basically, there are two ways to connect vswitches: Stack and cascade.
1. GBIC and SFP
1) GBIC
Cisco GBICGigaStack Gigabit Interface Converter) is a common and lo
optical fiber and optical transceiver in the middle Cisco 6509 is configured as: super engine SUP720, a 16-port Gigabit Optical module WS-X6816-GBIC, A 48-port fast switching electrical module WS-X6548-RJ-45 ).
Trunk is set up on the corresponding port connecting the optical transceiver's 6509 and the annett switch's frame sealing failure. The annett switch is divided into two VLANs, 172.25.6.0/24 or earli
jack (RJ) latch mechanism. (Common routers) ⑤mt-rj Optical fiber jumper: Send and receive one square fiber connector, one double fiber transceiver ST, SC Connector connectors are commonly used in general networks. St head inserted after the rotation half a week has a card mouth fixed, the disadvantage is easy to break; SC connector plug directly, the use is very convenient, the disadvantage is easy to fall out; FC Connection head General Telecomm
From the data, we can see that the bandwidth of the Ethernet switch stack is dozens of times the speed of the switch port, which can effectively improve the network performance, when the number of ports that a single switch can provide is insufficient to meet the requirements of the network computer, more than two switches must provide the corresponding number of ports, which also involves the connection between switches. Basically, there are two ways to connect a vswitch: Ethernet switch stack
The maximum rate of Ethernet switch stack is faster, Which is multiple times faster than the port rate of the switch. Not all switches support Ethernet switch stack, when the number of ports that a single switch can provide is insufficient to meet the requirements of the network computer, more than two switches must provide the corresponding number of ports, which also involves the connection between switches. Basically, there are two ways to connect a vswitch: Ethernet switch stack and cascade.
-----Indicates that the TC represents the normal mouth is baset, there is no uplink mouth.-L LAN Base Image-S Standard Image-E Enhanced Image1u (1RU height)The SFP is an abbreviation for the Small Form-factor pluggable, which can be simply understood as the GBICUpgrade version. The SFP module is less than half the size of the Gbic module and can be configured on the same panel with multipleThe number of ports that are more than one times. Other functi
Gigabit stacked card GigaStack GBIC (WS-X3550-XL) (the card already contains CAB-GS- 50CM stacked cables) are required ).
You can use either the chrysanthemum Link Method (providing 1g bandwidth) or the point-to-point method (providing 2G bandwidth ).
C. Both methods can be used for backup.
D. The Chrysanthemum Link Method supports stacking of up to 9 switches, and the point-to-point method supports up to 8 switches.
32. Does the Catalyst 3550 XL ser
dedicated Gigabit stacked card gigastack GBIC (WS-X3550-XL) (the card already contains cab-gs- 50CM stacked cables) are required ).B. Two stack methods can be used: the chrysanthemum Link Method (providing 1g bandwidth) or the point-to-point method (providing 2G bandwidth ).C. Both methods can be used for backup.D. The Chrysanthemum Link Method supports stacking of up to 9 switches, and the point-to-point method supports up to 8 switches.2. is redund
supports hot swapping of network modules, while Cisco3620/3640 does not support hot swapping of network modules.
* The Cisco3660 redundant power supply is built in, while the Cisco3620/3640 redundant power supply is external.
24. Why 3640 cannot identify NM-1FE2W?
Upgrade IOS to 12.0.7T
Vswitch Problems
About vswitches:
1. How is the stacking of Catalyst 35500XL/2950XL implemented?
A. dedicated stacked cables, 1 m long or 50 cm long (CAB-GS-1M or CAB-GS- 50CM) and dedicated Gigabit st
built-in, while the cisco3620/3640 redundant power supply is external.
30, why 3640 does not recognize nm-1fe2w?
Need to upgrade iOS to 12.0.7T
About switch Issues:
31. How is the stack of Catalyst 35500XL/2950XL implemented?
A. A dedicated stacking cable is required, 1 m long or 50 cm long (cab-gs-1m or cab-gs-50cm) and a dedicated gigabit stacking card Gigastack GBIC (WS-X3550-XL) with cab-gs-50cm stacking cable.
. There are 2 stacking method
the following:
Only the Fast Ethernet hybrid network module can support these two wan interface cards.
The network modules supporting these two interface cards are as follows:
NM-1FE2W, NM-2FE2W, NM-1FE1R2W, NM-2W.
The Ethernet hybrid network module does not support the following features:
NM-1E2W, NM-2E2W, NM1E1R2W.
19. What is the maximum rate of synchronization supported by Cisco3600 series routers (4A/S, NM (8A/S network module and WIC (2A/s wan Interface Card?
These network modules and WAN
card GigaStack GBIC (WS-X3550-XL) (the card already contains CAB-GS- 50CM stacked cables) are required ).B. Two stack methods can be used: the chrysanthemum Link Method (providing 1g bandwidth) or the point-to-point method (providing 2G bandwidth ).C. Both methods can be used for backup.D. The Chrysanthemum Link Method supports stacking of up to 9 switches, and the point-to-point method supports up to 8 switches.2. is redundant backup supported when
expansion slots. The expansion slot plug-in card can be placed in the 100 BaseTx module, 100 baseFx module, or even the ATM module and Gigabit Ethernet Interface Card (GBIC ). The details are as follows:
C2912-XL: 12 port 10/100 BaseTx adaptive
C2912MF-XL: 2 expansion slots, 12 port 100 BaseFX
C2924-XL: 24 port 10/100 BaseTX adaptive
C 2924C-XL: 22 port 10/100 BaseTX adaptive, 2 port 100 BaseFX
C 2924 M-XL: 2 expansion slots, 24 port 10/100 BaseTx ad
are modular, such as C2924M with two expansion slots. The plug-in card of the expansion slot can be placed in the 100BaseTx module and 100baseFx module, or even the ATM module and Gigabit Ethernet Interface Card (GBIC ). The details are as follows:
C2912-XL: 12 port 10/100 BaseTx adaptive
C2912MF-XL: 2 expansion slots, 12 port 100 BaseFX
C2924-XL: 24 port 10/100 BaseTX adaptive
C2924C-XL: 22 port 10/100 BaseTX adaptive, 2 port 100 BaseFX
ObjectiveIn the past few weeks, I have investigated and researched the security of GSM in many aspects, such as the loopholes in GSM communication protocol. In addition, I have a security audit of the most widely used BTS software in the world today. In this article, I'll show you a few of the vulnerabilities I've found in this open source product that will allow an attacker to invade the base station transceiver (BTS) and remotely control its
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