XZ company requires to build its network according to the modular enterprise network architecture. XZ company has 1 research and development base in Shenzhen and Xi’an; one office building in Beijing and Shanghai; offices with more than 50 people in 23 provincial capital cities; small offices with no more than 8 people in 200 small and medium cities; There are usually more than 200 marketing and technical personnel on business trips at any time, and some of them are often located in areas lacking Internet access and can only dial-up to the headquarters through the telephone network. Due to environmental and cost issues, some offices do not have access to headquarters via leased lines or PSWAN connections. According to these circumstances, the network module that XZ company should have ________.(Multiple choice)

XZ company requires to build its network according to the modular enterprise network architecture. XZ company has 1 research and development base in Shenzhen and Xi’an; one office building in Beijing and Shanghai; offices with more than 50 people in 23 provincial capital cities; small offices with no more than 8 people in 200 small and medium cities; There are usually more than 200 marketing and technical personnel on business trips at any time, and some of them are often located in areas lacking Internet access and can only dial-up to the headquarters through the telephone network. Due to environmental and cost issues, some offices do not have access to headquarters via leased lines or PSWAN connections. According to these circumstances, the network module that XZ company should have ________.(Multiple choice)
A . Dial-up access
B. Secure Authentication
C. VPN access
D. Large branch network

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Answer: AC