ipconfig /flushdns command
What two protocols are used to deliver mail messages?
IMAP and POP3 are the two most commonly used Internet mail protocols for retrieving emails. Both protocols are supported by all modern email clients and web servers.
What protocol is used by Windows to share files and printers on a network?
The “primary operating system” is the operating system on which the file sharing protocol in question is most commonly used. On Microsoft Windows, a network share is provided by the Windows network component “File and Printer Sharing for Microsoft Networks”, using Microsoft’s SMB (Server Message Block) protocol.
What two terms are used to describe the User Datagram Protocol UDP?
UDP (User Datagram Protocol) is a connectionless protocol of the internet protocol family that operates at the transport layer and was specified in 1980 in RFC (Request for Comments) 768. As a lean and almost delay-free alternative to TCP, UDP is used for the fast transmission of data packets in IP networks.
What is used to identify the network portion of an IP address?
The “host portion” of the ip address is 0.0.1.22 . Using your notation, the third octet of ip 192.168.33.22 (mask 255.255.224.0) is: 001. 00001 . To get the network portion of an IP address, you must perform a binary AND of the ip address and its netmask.
How do DNS servers work?
Domain Name Servers (DNS) are the Internet’s equivalent of a phone book. They maintain a directory of domain names and translate them to Internet Protocol (IP) addresses. This is necessary because, although domain names are easy for people to remember, computers or machines, access websites based on IP addresses.
What ports to open for Windows file sharing?
Opening Windows 2012 File Sharing Ports
- UDP 138, File and Printer Sharing (NB-Datagram-In)
- UDP 137, File and Printer Sharing (NB-Name-In)
- TCP 139, File and Printer Sharing (NB-Session-In)
- TCP 445, File and Printer Sharing (SMB-In)
What port does Windows use for file sharing?
Microsoft file sharing SMB: User Datagram Protocol (UDP) ports from 135 through 139 and Transmission Control Protocol (TCP) ports from 135 through 139. Direct-hosted SMB traffic without a network basic input/output system (NetBIOS): port 445 (TCP and UPD).
What is Windows file sharing protocol?
The Server Message Block (SMB) Protocol is a network file sharing protocol, and as implemented in Microsoft Windows is known as Microsoft SMB Protocol. The set of message packets that defines a particular version of the protocol is called a dialect. The Common Internet File System (CIFS) Protocol is a dialect of SMB.
How do I find out what IP addresses are on my network?
Finding your IP address without using the command prompt
- Click the Start icon and select Settings.
- Click the Network & Internet icon.
- To view the IP address of a wired connection, select Ethernet on the left menu pane and select your network connection, your IP address will appear next to “IPv4 Address”.
What is Netid and Hostid?
Networking. Share. In classful addressing, an IP address of class A, B and C is divided into netid and hostid. The netid determines the network address while the hostid determines the host connected to that network.
What is network and host portion in an IP address?
The octet in the subnet mask containing 224 has three consecutive binary 1s in it: 11100000 . Therefore the “network portion” of the whole IP address is: 192.168.32.0 . The “host portion” of the ip address is 0.0.1.22 . Using your notation, the third octet of ip 192.168.33.22 (mask 255.255.224.0) is: 001.
Why is DNS useful?
The importance of DNS. The Domain Name System (DNS) is used to convert IP addresses into readable domains such as bbc.co.uk. Without DNS everyone would have to remember random strings of number to access different websites, or at least Google’s IP address.
What are the 13 root servers?
In total, there are 13 main DNS root servers, each of which is named with the letters ‘A’ to ‘M’. They all have a IPv4 address and most have an IPv6 address. Managing the root server is ICANN’s responsibility (Internet Corporation for Assigned Names and Numbers).
How DNS works step by step?
Let’s take an in-depth look at the process:
- Step 1: Request information.
- Step 2: Ask the recursive DNS servers.
- Step 3: Ask the root name servers.
- Step 4: Ask the TLD name servers.
- Step 5: Ask the authoritative DNS servers.
- Step 6: Retrieve the record.
- Step 7: Receive the answer.
What is TCP 139 used for?
What is Port 445 and Port 139 used for? NetBIOS stands for Network Basic Input Output System. It is a software protocol that allows applications, PCs, and Desktops on a local area network (LAN) to communicate with network hardware and to transmit data across the network.
Which port is used for shared folder?
List of Ports number: Understanding Shared Folders and the Windows Firewall
Is port 445 secure?
Many security attacks are a numbers game; that’s why the large number of attacks using a TCP port 445 exploit is no surprise. Along with ports 135, 137 and 139, port 445 is a traditional Microsoft networking port. Malware seeking to exploit under-secured Windows systems is a likely source.
What is the difference between SMB and NFS?
NFS is a protocol native to UNIX systems, while Samba is a program that provides SMB, a protocol native to Windows systems. Linux supports both as file systems. From the point of view of a Windows user, SMB may be the only available option. SMB does not do the same thing.
Can Windows connect to NFS?
Download and install Microsoft Windows Services for Unix (SFU). You only need to install the NFS Client and the User Name Mapping. Once SFU is installed and configured, mount the cluster and map it to a drive using the Map Network Drive tool or from the command line.
Is FTP faster than SMB?
SMB is a “real” file sharing tool but it relies on a “virtual network” implementation that makes it impossible to limit it’s functionality on the TCP/IP level. FTP can be extremely fast to transfer large documents (though it’s way less efficient with small files).FTP is faster than SMB but it has less functionality.
Can two computers with different subnet masks communicate?
Generally speaking, no two devices should have the same IP address unless they are behind a NAT device. Computers need routers to communicate with devices that are not on their same logical subnet.
What is IP subnetting?
A subnetwork or subnet is a logical subdivision of an IP network. The practice of dividing a network into two or more networks is called subnetting. Computers that belong to a subnet are addressed with an identical most-significant bit-group in their IP addresses.
How subnetting is done?
The most common use of subnetting is to control network traffic. Subnetting is done by borrowing host bits and using them as network bits. To begin, let’s look at our ABC company network address (192.168.1.0) and its subnet mask (255.255.255.0) as expressed in binary.
Photo in the article by “Wikimedia Commons”