单项选择题
A. all voice traffic
B. all traffic with dscp 18 or dscp 43
C. all traffic with dscp 18 and dscp 43
D. all traffic with ip precedence 0 or 1
E. all traffic with ip precedence 4 and 5
单项选择题 While troubleshooting a network outage, you discover that an employee brought a switch from home into the office to connect additional equipment to the network. In order to increase his speed, he connected this switch to both network ports in his office, resulting in a bridge loop. Which of these can you implement to prevent future occurrences of this issue?（）
单项选择题 Refer to the exhibit. MPLS has been enabled on router PE11. Which of these statements is correct regarding the output display shown in the exhibit? （）
单项选择题 When implementing MPLS VPNs between CE and PE routers, which of these statements is correct? （）
