1. [单选题]OSI七层模型中，数据链路层(data link layer)的数据封装名称为（）
A. 比特
B. 帧
C. 包
D. 段
2. [单选题]命令ip nat pool aaa 192.1.1.2 192.1.1.10 netmask 255.255.255.0的作用是()
A. 指定可访问地址
B. 定义地址池
C. 指定路由
D. 定义哪些地址可以进行地址转换
3. [多选题]You need to describe the various types of flow control to your co-workers. Which of the following are types of flow control that can be used in a network? (Choose three)
A. Congestion avoidance
B. Windowing
C. Cut-through
D. Buffering
E. Load Balacing
F. F. Fast Forward
4. [单选题]While troubleshooting a connectivity issue from a PC you obtain the following information:Local PC IP address: 190.0.3.35/24
A. Default Gateway: 190.0.3.1
B. Remote Server: 190.0.5.250/24
C. You then conduct the following tests from the local PC:
D. Ping 127.0.0.1 - Unsuccessful
E. Ping 190.0.3.35 - Successful
F. Ping 190.0.3.1 - Unsuccessful
G. Ping 190.0.5.250 – Unsuccessful
H. What is the underlying cause of this problem?
I. TCP/IP not correctly installed
J. Local physical layer problem
K. NIC not functioning
L. Remote physical layer problem
M. None of the above
5. [单选题]对于运行OSPF协议的路由器来说，RouterID是路由器的唯一标识，所以协议规定：必须保证RouterID在如下范围之内唯一（）。
A. 网段内
B. 区域内
C. 自治系统内
D. 整个因特网
