Ethernet not working

I have been installed Manjaro XFCE. please help me. my ethernet connection is not working.

System:
  Kernel: 5.9.16-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.1 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.9-x86_64 
  root=UUID=2fa69ce3-1f85-4565-8910-e68151b536a7 ro quiet apparmor=1 
  security=apparmor udev.log_priority=3 
  Desktop: Xfce 4.16.0 tk: Gtk 3.24.24 info: xfce4-panel wm: xfwm4 
  dm: LightDM 1.30.0 Distro: Manjaro Linux 
Machine:
  Type: Laptop System: ASUSTeK product: X542UN v: 1.0 serial: <filter> 
  Mobo: ASUSTeK model: X542UN v: 1.0 serial: <filter> 
  UEFI: American Megatrends v: X542UN.302 date: 11/06/2017 
Battery:
  ID-1: BAT0 charge: 17.4 Wh condition: 19.2/38.0 Wh (51%) volts: 7.6/7.6 
  model: ASUSTeK ASUS Battery type: Li-ion serial: N/A status: Discharging 
  cycles: 1508 
CPU:
  Info: Quad Core model: Intel Core i5-8250U bits: 64 type: MT MCP 
  arch: Kaby Lake note: check family: 6 model-id: 8E (142) stepping: A (10) 
  microcode: E0 L2 cache: 6 MiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 28808 
  Speed: 900 MHz min/max: 400/3400 MHz Core speeds (MHz): 1: 900 2: 900 3: 900 
  4: 900 5: 900 6: 900 7: 900 8: 900 
  Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled 
  Type: l1tf 
  mitigation: PTE Inversion; VMX: conditional cache flushes, SMT vulnerable 
  Type: mds mitigation: Clear CPU buffers; SMT vulnerable 
  Type: meltdown mitigation: PTI 
  Type: spec_store_bypass 
  mitigation: Speculative Store Bypass disabled via prctl and seccomp 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional, 
  IBRS_FW, STIBP: conditional, RSB filling 
  Type: srbds mitigation: Microcode 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: Intel UHD Graphics 620 vendor: ASUSTeK driver: i915 v: kernel 
  bus ID: 00:02.0 chip ID: 8086:5917 
  Device-2: NVIDIA GP108M [GeForce MX150] vendor: ASUSTeK driver: nouveau 
  v: kernel bus ID: 01:00.0 chip ID: 10de:1d10 
  Device-3: IMC Networks USB2.0 VGA UVC WebCam type: USB driver: uvcvideo 
  bus ID: 1-6:4 chip ID: 13d3:5a01 serial: <filter> 
  Display: x11 server: X.Org 1.20.10 driver: loaded: intel,nouveau 
  unloaded: modesetting alternate: fbdev,nv,vesa display ID: :0.0 screens: 1 
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.0x11.2") 
  s-diag: 582mm (22.9") 
  Monitor-1: eDP1 res: 1920x1080 hz: 60 dpi: 143 size: 340x190mm (13.4x7.5") 
  diag: 389mm (15.3") 
  OpenGL: renderer: Mesa Intel UHD Graphics 620 (KBL GT2) v: 4.6 Mesa 20.3.3 
  direct render: Yes 
Audio:
  Device-1: Intel Sunrise Point-LP HD Audio vendor: ASUSTeK 
  driver: snd_hda_intel v: kernel alternate: snd_soc_skl bus ID: 00:1f.3 
  chip ID: 8086:9d71 
  Sound Server: ALSA v: k5.9.16-1-MANJARO 
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: ASUSTeK driver: r8168 v: 8.048.03-NAPI modules: r8169 port: d000 
  bus ID: 02:00.0 chip ID: 10ec:8168 
  IF: enp2s0 state: down mac: <filter> 
  Device-2: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter 
  vendor: AzureWave driver: ath10k_pci v: kernel port: d000 bus ID: 03:00.0 
  chip ID: 168c:0042 
  IF: wlp3s0 state: up mac: <filter> 
Drives:
  Local Storage: total: 931.51 GiB used: 12.82 GiB (1.4%) 
  SMART Message: Required tool smartctl not installed. Check --recommends 
  ID-1: /dev/sda maj-min: 8:0 vendor: HGST (Hitachi) model: HTS541010B7E610 
  size: 931.51 GiB block size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s 
  serial: <filter> rev: 1A03 
Partition:
  ID-1: / raw size: 250 GiB size: 245.08 GiB (98.03%) used: 9.08 GiB (3.7%) 
  fs: ext4 dev: /dev/sda2 maj-min: 8:2 
  ID-2: /boot/efi raw size: 512 MiB size: 511 MiB (99.80%) 
  used: 6.8 MiB (1.3%) fs: vfat dev: /dev/sda1 maj-min: 8:1 
Swap:
  Alert: No Swap data was found. 
Sensors:
  System Temperatures: cpu: 40.0 C mobo: N/A gpu: nouveau temp: 38.0 C 
  Fan Speeds (RPM): cpu: 2500 
Info:
  Processes: 248 Uptime: 2h 18m wakeups: 1 Memory: 7.66 GiB 
  used: 2.14 GiB (27.9%) Init: systemd v: 247 Compilers: gcc: 10.2.0 
  Packages: 1151 pacman: 1149 lib: 370 flatpak: 0 snap: 2 Shell: Bash v: 5.1.0 
  running in: xfce4-terminal inxi: 3.2.02 

Try a different cable or make sure that the one you have does indeed work.

There was a user with what looks to be the same hardware and a network issue, have you read/seen this post, maybe it could be your solution to.