Network+ Review

1. What type of fiber commonly uses lasers as a transmission source?
• Single-Mode Fiber  is used for laser trasmission
• Multi-Mode Fiber is used for LED most commonly 
• large-core fiber is another name to multi-mode fiber 
2. Is distance the only advantage in using single-mode over multi-mode fiber-optic cable?
• Multi-Mode Fiber
• short range communication (up to 2 km) 
• does not use lasers, most commonly uses LED 
• inexpensive light source 
• uses an orange color cable 
• called multi-mode because light can take more than one path through the cable 
• single-mode fiber
• small core 
• light only takes one path 
• up to 100km without processing
• most commonly uses laser light 
• normally a yellow cable color
• Short Answer, YES.
3. What is the difference between a logical and a physical network topologies?

• Completely different forms of documenting a network
• physical network layout
• 
• shows routers, servers, other connections 
• main issue is determining what subnet things are on 
• devices in a physical map can be on completely different networks 
• used for troubleshooting physical issues (i.e. cabling and conections)
• Logical network diagram 
• 
• you can see the routing paths 
• used for troubleshooting data connections
• given subnets 
• identifies location routers