单项选择题
A. The switch on you MPLS core that was not produced by Cisco does not support oversized packets
B. No switches support oversized packets
C. By definition, the maximum MTU is 1500 bytes
D. As MPLS VPN labeling increases the size of the packet by 8 bytes, the IP MTU should have been changed to 1508
单项选择题 Assuming that an IP packet is sent from a source address in VLAN1 to a destination address in VLAN2 through a layer-3 switch, which part of the packet will be changed?（）
单项选择题 On a Cisco Catalyst 4500 Series, the fail LED is lit for one if its two power supplies. Which command would you use to check on this problem ?（）
单项选择题 A Catalyst switch has just been installed and configured, and is not working as expected. You have decided to capture multiple show command outputs to study. Which one command could you use that includes the output of many other show commands, such as show version and show running-config?（）