diff --git a/1ano/2semestre/labi/tema03/src/tcp_client.py b/1ano/2semestre/labi/tema03/src/tcp_client.py
new file mode 100644
index 0000000..0df491d
--- /dev/null
+++ b/1ano/2semestre/labi/tema03/src/tcp_client.py
@@ -0,0 +1,19 @@
+import socket
+
+
+def main(args=None):
+    tcp_s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    tcp_s.connect(('localhost', 1234))
+
+    while True:
+        str_data = input("$ ")
+        if not str_data or str_data == "stop":
+            break
+        tcp_s.send(str_data.encode("utf-8"))
+
+        b_data = tcp_s.recv(4096)
+        print("-> " + b_data.decode("utf-8"))
+
+
+if __name__ == '__main__':
+    main()
diff --git a/1ano/2semestre/labi/tema03/src/tcp_server.py b/1ano/2semestre/labi/tema03/src/tcp_server.py
new file mode 100644
index 0000000..1f0c722
--- /dev/null
+++ b/1ano/2semestre/labi/tema03/src/tcp_server.py
@@ -0,0 +1,22 @@
+import socket
+
+
+def main(args=None):
+    tcp_s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    tcp_s.bind(('', 1234))
+
+    tcp_s.listen(1)
+    client_s, client_addr = tcp_s.accept()
+
+    while True:
+        b_data = client_s.recv(4096)
+        if not b_data or b_data == "stop":
+            break
+        client_s.send(b_data.upper())
+
+    client_s.close()
+    tcp_s.close()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/1ano/2semestre/labi/tema03/src/udp_chat_client.py b/1ano/2semestre/labi/tema03/src/udp_chat_client.py
new file mode 100644
index 0000000..b3bcd63
--- /dev/null
+++ b/1ano/2semestre/labi/tema03/src/udp_chat_client.py
@@ -0,0 +1,25 @@
+import select
+import socket
+import sys
+
+
+def main():
+    udp_s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    udp_s.bind(("127.0.0.1", 0))
+    server_addr = ("127.0.0.1", 1234)
+
+    while True:
+        rsocks = select.select([udp_s, sys.stdin], [], [])[0]
+
+        for sock in rsocks:
+            if sock == udp_s:
+                b_data, addr = udp_s.recvfrom(4096)
+                sys.stdout.write(f"-> {b_data.decode('utf-8')}")
+            elif sock == sys.stdin:
+                print('<- ', end='')
+                msg = sys.stdin.readline()
+                udp_s.sendto(msg.encode("utf-8"), server_addr)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/1ano/2semestre/labi/tema03/src/udp_chat_server.py b/1ano/2semestre/labi/tema03/src/udp_chat_server.py
new file mode 100644
index 0000000..3b4f46b
--- /dev/null
+++ b/1ano/2semestre/labi/tema03/src/udp_chat_server.py
@@ -0,0 +1,31 @@
+import socket
+
+
+def main():
+    udp_c = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    udp_c.bind(("127.0.0.1", 1234))
+
+    addr_list = []
+
+    while True:
+        b_data, addr = udp_c.recvfrom(4096)
+        print(f"Received from {addr}: {b_data.decode('utf-8')}")
+
+        if addr not in addr_list:
+            addr_list.append(addr)
+
+        if b_data.decode("utf-8") == "stop":
+            print("Stopping server...")
+            break
+
+        for laddr in addr_list:
+            if laddr == addr:
+                continue
+            print(f"Sending to {laddr}: {b_data}")
+            udp_c.sendto(b_data, laddr)
+
+    udp_c.close()
+
+
+if __name__ == "__main__":
+    main()
diff --git a/1ano/2semestre/labi/tema03/src/udp_client.py b/1ano/2semestre/labi/tema03/src/udp_client.py
new file mode 100644
index 0000000..7e6c555
--- /dev/null
+++ b/1ano/2semestre/labi/tema03/src/udp_client.py
@@ -0,0 +1,23 @@
+import socket
+
+
+def main():
+    udp_s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    udp_s.bind(("127.0.0.1", 0))
+    server_addr = ("127.0.0.1", 1234)
+
+    while True:
+        msg = input(f"$ ")
+        udp_s.sendto(msg.encode("utf-8"), server_addr)
+
+        if msg == "stop":
+            break
+
+        b_data, addr = udp_s.recvfrom(4096)
+        print(f"-> {b_data.decode('utf-8')}")
+
+    udp_s.close()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/1ano/2semestre/labi/tema03/src/udp_server.py b/1ano/2semestre/labi/tema03/src/udp_server.py
new file mode 100644
index 0000000..443af6f
--- /dev/null
+++ b/1ano/2semestre/labi/tema03/src/udp_server.py
@@ -0,0 +1,23 @@
+import socket
+
+
+def main():
+    udp_c = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    udp_c.bind(("127.0.0.1", 1234))
+
+    while True:
+        b_data, addr = udp_c.recvfrom(4096)
+        print(f"Received from {addr}: {b_data.decode('utf-8')}")
+
+        if b_data.decode("utf-8") == "stop":
+            print("Stopping server...")
+            break
+
+        print(f"Sending to {addr}: {b_data.upper()}")
+        udp_c.sendto(b_data.upper(), addr)
+
+    udp_c.close()
+
+
+if __name__ == "__main__":
+    main()