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6.12.10 Practice Questions Network Utilities

Which of the following tools allow for remote management of servers?
SSH

Telnet

Explanation

Both Telnet and SSH are tools for remote management of servers. However, you should avoid using Telnet as it sends all data, including authentication information, clear text on the network. POP3 is for retrieving e-mail from a remote server, and FTP is for transferring files. LDAP is a protocol used to access information about network resources from a directory service.

Which utility would you use to view current connections and active sessions and ports on a computer?
Netstat

Explanation

Netstat shows IP-related statistics including:

– Incoming and outgoing connections.
– Active sessions, ports, and sockets.
– The local routing table.

Ipconfig displays IP configuration information for network adapters. Use ipconfig to view IP address, subnet mask, and default gateway configuration. Nslookup resolves (looks up) the IP address of a host name. Ping sends an ICMP echo request/reply packet to a remote host. A response from the remote host indicates that both hosts are correctly configured and a connection exists between them.

Which of the following utilities can you use from the command line on a Linux system to see a list of the installed network interfaces, along with their current status and configuration?
ifconfig

Explanation

ifconfig is used on Linux (and Mac OS) systems to display the installed network interfaces, their current status, and the current configuration settings for each interface, including the MAC address, IP address, broadcast address, and subnet address.

Ipconfig is used on Windows systems to view the installed network interfaces and their IP address, subnet mask, and default gatewar configuration. Netstat is used on a Windows. system to display IP-related statistics, netconfig, if lookup and netinfo are not the names of real networking utilities.

You need to view detailed IP configuration information on Windows workstation. In addition to the IP address, subnet mask, and default gateway configuration, you need to now see the network card’s MAC address and the addresses of the DHCP and DNS servers the workstation is communicating with.

What command would you enter at the command line to see this detailed information?

ipconfig /all

Use ipconfig /all to view detailed configuration information including the MAC address and the DHCP and DNS servers the workstation is communicating with.

When you see the address of the DNS server, you realize that this information needs to be updated. Earlier in the day, you implemented a new DNS server with a new IP address. The workstation will update this information in 24 hours. What command can you enter at the command line to update the DNS server information right away?
ipconfig /flushdns

Explanation

Use ipconfig /flushdns to flush (or remove) all the entries in the workstations’ current DNS cache. If the IP address of a network server is changed, your local cache will contain the old IP address until the cache is updated (every 24 hours) or the flushdns option is used.

Resolves (look ups) the IP address of the specified hostname.
Nslookup
Tests connectivity between devices and shows the routers in the path between the two devices.
Tracert
Sends an ICMP echo request/reply packet to a remote host.
Ping
Displays current connecitons and incoming and outgoing connections.
Netstat
A few simple replies to this reques from the remote host indicates that a connection exists between sender and receiver.
Ping
Displays active sessions, ports, and sockets, and the local routing table.
Netstat
When used with the -t option, performs a continues connection test.
Ping
Explanation
Ping sends an ICMP echo request/reply packet to a remote host. A response from the remote host indicates that both hosts are correctly configured and a connection exists between them. Using ping -t performs a continuous connection test (press Ctrl+C to stop sending the ping requests).

Tracert is similar to the ping utility in that it tests connectivity between devices; however, tracert also shows the routers in the path between the two devices. Responses from each hop on the route are measured three times to provide an accurate representation of how long the packet takes to reach, and be returned by the specific host.

Nslookup resolves (looks up) the IP address of the specified hostname. It also displays additional name resolution information, such as the DNS server used for the lookup request.

Netstat displays the following IP-related statistics:

– Current connections.
– Incoming and outgoing connections.
– Active sessions, ports, and sockets.
– The local routing table.

Ipconfig displays IP configuration information for network adapters.

Which of the following utilities would you use to do the following?

– Establish a remote server management session.
– Send unencrypted (clear text) transmissions to the remote server.
– Use mostly to manage specialized industrial and scientific devices.

Telnet

Explanation

The Telnet utilities is used to do the following:

– Establish a remote server management session.
– Send unencrypted (clear text) transmission to the remote server.
– Use mostly to manage specialized industrial and scientific devices.

SSH is similar to Telnet. It is used for remote server management, however, SSH encrypts all communications and is much more secure. PuTTY,xterm, and RUMBA are all terminal emulators.

What is name of the utility which is similar to Telnet, that you can use to establish a secure remote server management session?
SSH

Explanation

Similar to Telnet, the SSH utility is used for remote server management; however, SSH encrypts all communications and is much more secure.

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