问Ubuntu服务器清洁安装后的网络问题& DHCP的选择

EN

cat /etc/network/interfaces

# This file describes the network interfaces available on your system 
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface  
auto lo  
iface lo inet loopback

ip link show

1: lo: <LOOPBACK,UP,LOWER_UP) mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00 00:00:00:00 

2: enp1s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 01:7d:7b:bc:7e:ee brd ff:ff:ff:ff:ff:ff 

3: wlp2s0b1: (330008031. HULTICHSI) <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether e0:06:e6:3f:01:04 brd ff:ff:ff:ff:ff:ff 

lspci -v

// a lot of devices //

01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller (rev 05) 
    Subsystem: acer Incorporated [ALI] RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller 
    Flags: bus master, fast devsel, latency 0, IRQ 29 
    I/0 ports at 4000 [size=256] 
    Memory at 40004000 (64-bit, prefetchable) [size=4K] 
    Memory at 40000000 (64-bit, prefetchable) [size=16K]
    Capabilities: <access denied> 
    Kernel driver in use: r8169 
    Kernel modules: r8169 

02:00.0 Network controller: Broadcom Limited BCM4313 802.11bgn Wireless Network Adapter (rev 01) 
    Subsystem: Foxconn International, Inc. BCM4313 802.11bgn Wireless Netuork adapter 
    Flags: bus master, fast devsel, latency 0, IRQ 17 
    Memory at 44000000 (64-bit, non-prefetchable) [size=16K] 
    Capabilities: <access denied> 
    Kernel driver in use: bcma-pci-bridge 
    Kernel modules: bcma 

03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. TS5209 PCI Express Card Reader (rev. 01) 
    Subsystem: acer Incorporated [0L1] 3185209 PCI Express Card Reader 
    ...