Which of the following components must be elected before the Spanning Tree Protocol can converge in a switched LAN?（）

单项选择题What is the subnetwork number of a host with an IP address of 172.16.210.0 22?（）

A. 172.16.42.0
B. 172.16.107.0
C. 172.16.208.0
D. 172.16.252.0
E. 172.16.254.0

多项选择题Which statements describe the routing protocol OSPF?（）

A. It supports VLSM.
B. It is used to route between autonomous systems.
C. It confines network instability to one area of the network.
D. It increases routing overhead on the network.
E. It allows extensive control of routing updates.
F. It is simpler to configure than RIP v2.

单项选择题On point-to-point networks, OSPF hello packets are addressed to which address?（）

A.127.0.0.1
B.172.16.0.1
C.192.168.0.5
D.223.0.0.1
E.224.0.0.5
F.254.255.255.255

多项选择题Which of the following IP addresses can be assigned to host devices?（）

A.205.7.8.32/27
B.191.168.10.2/23
C.127.0.0.1
D.224.0.0.10
E.203.123.45.47/28
F.10.10.0.0/13

多项选择题Which of the following are VLAN frame encapsulation types that may be configured on a Catalyst switch?（）

A. VTP
B. ISL
C. CDP
D. 802.1Q
E. 802.1p
F. LLC