The command-line tool used to list a host’s active incoming connections is:
Used without parameters, netstat displays active TCP connections.
Note: Netstat displays active TCP connections, ports on which the computer is listening, Ethernet statistics, the IP routing table, IPv4 statistics (for the IP, ICMP, TCP, and UDP protocols), and IPv6 statistics (for the IPv6, ICMPv6, TCP over IPv6, and UDP over IPv6 protocols).
A computer that has an IP address of 169.254.0.1 cannot access the network. Which of the following services should you confirm is available?
169.254.0.1 is an APIPA address. An APIPA address is used when the DHCP server is not available.
Which network does the IP address 126.96.36.199 belong to?
The ping tool is used to: (Choose two.)
Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol
(IP) network and to measure the round-trip time for messages sent from the originating host to a destination computer. To have your PC ping itself, type ping 127.0.0.1.
A network device that associates a Media Access Control (MAC) address with a port is a:
A switch begins learning the local MAC addresses as soon as it is connected to other devices or to a network. This learning capability makes switches easy to use on a network.
The switch learning process works like this:
As a PC or other networked device sends a frame to another device through the switch, the switch captures the source MAC address of the frame and the interface that received it.
The switch confirms or adds the MAC address and the port to the lookup table.
A Layer 2 device that connects multiple computers within a network is a:
Layer 2 switching uses the media access control address (MAC address) from the host’s network interface cards (NICs) to decide where to forward frames.
A cable that meets the l000BaseT standard has a maximum length of:
When used for 10/100/1000BASE-T, the maximum allowed length of a Cat 6 cable is 100 meters or 328 feet.
A router’s static route is set by the:
Static routing is a form of routing that occurs when a router uses a manually-configured routing entry, rather than
information from a dynamic routing protocol to forward traffic.
Which setting is used to determine the Domain Name System (DNS) settings on a client computer?
nslookup is a network administration command-line tool available for many computer operating systems for querying the Domain Name System (DNS) to obtain domain name or IP address mapping or for any other specific DNS record. Question: 172
The default subnet mask for a Class B network is:
Class A default subnet mask is 255.0.0.0. Class B default subnet mask is 255.255.0.0. Class C default subnet mask is 255.255.255.0. Question: 173
The default port used for SMTP is:
SMTP by default uses TCP port 25.
Which of the following represents a Media Access Control (MAC) address?
The standard (IEEE 802) format for printing MAC-48 addresses in human-friendly form is six groups of two hexadecimal digits, separated by hyphens (-) or colons (:), in transmission order (e.g. 01-23-45-67-89-ab or 01:23:45:67:89:ab ).
Connecting to a private network address from a public network requires:
The majority of NATs map multiple private hosts to one publicly exposed IP address. In a typical configuration, a local network uses one of the designated “private” IP address subnets (RFC 1918). A router on that network has a private address in that address space. The router is also connected to the Internet with a “public” address assigned by an Internet service provider.
One advantage of dynamic routing is that it:
Dynamic Routing, also called adaptive routing, describes the capability of a system, through which routes are characterized by their destination, to alter the path that the route takes through the system in response to a change in conditions. The adaptation is intended to allow as many routes as possible to remain valid (that is, have destinations that can be reached) in response to the change.