Cisco Certified Network Associate 0 (ccna)

Correct Answer: C


QUESTION 16
What is a function of MAC learning on a switch?

1. 
   A static MAC address is manually added to the MAC table.
   
2. 
   MAC address learning is disabled by default on all VLANs.
   
3. 
   Frames received for a destination MAC address not listed in the address table are dropped.
   
4. 
   The MAC address table is used to populate the ARP table.
   

Correct Answer: A


QUESTION 17
What is the difference between 1000BASE-LX/LH and 1000BASE-ZX interfaces?

1. 
   1000BASE-LX/LH interoperates with multimode and single-mode fiber, and 1000BASE-ZX needs a conditioning patch cable with a multimode.
   
2. 
   1000BASE-ZX is supported on links up to 1000km, and 1000BASE-LX/LH operates over links up to 70 km.
   
3. 
   1000BASE-ZX interoperates with dual-rate 100M/1G 10Km SFP over multimode fiber, and 1000BASE-LX/LH supports only single-rate.
   
4. 
   1000BASE-LX/LH is supported on links up to 10km, and 1000BASE-ZX operates over links up to 70 km.
   

Correct Answer: D


QUESTION 18
What is the effect when loopback interfaces and the configured router ID are absent during the OSPF Process configuration?

1. 
   The router ID 0.0.0.0 is selected and placed in the OSPF process.
   
2. 
   No router ID is set, and the OSPF protocol does not run.
   
3. 
   The highest up/up physical interface IP address is selected as the router ID.
   
4. 
   The lowest IP address is incremented by 1 and selected as the router ID.
   

Correct Answer: C


QUESTION 19
Refer to the exhibit.

What is expected when PC_A sends data to PC_B after their initial communication?

1. 
   The source and destination MAC addresses remain the same
   
2. 
   The switch rewrites the source and destination MAC addresses with its own
   
3. 
   The source MAC address is changed
   
4. 
   The destination MAC address is replaced with ffff.ffff.ffff