98-366 : Networking Fundamentals : Part 01
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One advantage of dynamic routing is that it:
- Automatically maintains routing tables.
- Limits traffic derived from routing protocols.
- Reduces broadcast traffic.
- Automatically enables DHCP.
Explanation: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.
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Which of the following represents a Media Access Control (MAC) address?
- GV:ZC:KK:DK:FZ:CA
- 255.255.255.0
- 05:35:AB:6E:Al:25
- 127.0.0.1
Explanation: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 ).
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Connecting to a private network address from a public network requires:
- Network address translation (NAT).
- Dynamic Host Configuration Protocol (DHCP).
- Network Access Protection (NAP).
- Dynamic domain name system (DDNS).
Explanation: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.
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A network device that associates a Media Access Control (MAC) address with a port is a:
- DSL modem
- Hub
- Router
- Switch
Explanation: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:
1.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.
2.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:
- Repeater
- Switch
- Router
- Packet
Explanation: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.
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A cable that meets the l000BaseT standard has a maximum length of:
- 100 m
- 250 m
- 500 m
- 1,000 m
Explanation:When used for 10/100/1000BASE-T, the maximum allowed length of a Cat 6 cable is 100 meters or 328 feet.
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A router’s static route is set by the:
- Adjacent network
- Next upstream router
- Network administrator
- Routing protocol
Explanation: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.
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Which setting is used to determine the Domain Name System (DNS) settings on a client computer?
- TELNET
- NSLOOKUP
- PATHPING
- NETSTAT
Explanation: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.
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The default subnet mask for a Class B network is:
- 0.0.0.255
- 0.0.255.255
- 255.0.0.0
- 255.255.0.0
Explanation: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. -
The default port used for SMTP is:
- 23
- 25
- 80
- 8080
Explanation:SMTP by default uses TCP port 25.
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The ping tool is used to: (Choose two.)
- Determine the network portion of a host address.
- Self-test a host’s own network interface.
- Determine whether a host is reachable.
- Manage a host’s session when UDP is used.
Explanation: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.
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Which of the following are features of DHCP? (Choose two.)
- IP address resolution to canonical names
- Secure shell connections
- Address reservation
- Network file transfer
- IP address exclusion
Explanation:* The Dynamic Host Configuration Protocol (DHCP) is a standardized network protocol used on Internet Protocol (IP) networks for dynamically distributing network configuration parameters, such as IP addresses for interfaces and services.
* Some network devices need to use statically assigned IP addresses rather than addresses dynamically assigned through DHCP. For example, DHCP servers must have statically configured IP addresses. Also, some devices (such as legacy network printers) do not support DHCP.
For the devices that need static IP assignments, the company creates an exclusion range from each IP address range. -
The command-line tool used to list a host’s active incoming connections is:
- NETSTAT
- IPCONFIG
- NSLOOKUP
- PING
Explanation: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).
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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?
- WINS
- DNS
- DHCP
- TFTP
Explanation:169.254.0.1 is an APIPA address. An APIPA address is used when the DHCP server is not available.
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Which network does the IP address 220.100.100.100 belong to?
- 220.100.100.0/24
- 220.100.100.1/24
- 255.255.255.0/24
- 255.255.255.1/24
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Which subnet mask is valid?
- 255.255.255.240
- 255.255.255.228
- 255.255.255.164
- 255.255.255.245
Explanation:These are valid:
98-366 Part 01 Q16 001 -
A service that resolves NetBIOS names to IP addresses is:
- Domain Name Service (DNS).
- Internet Service Provider (ISP).
- Address Resolution Protocol (ARP).
- Windows Internet Name Service (WINS).
Explanation:Windows Internet Name Service (WINS) is Microsoft’s implementation of NetBIOS Name Service (NBNS), a name server and service for NetBIOS computer names. Effectively, WINS is to NetBIOS names what DNS is to domain names — a central mapping of host names to network addresses.
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What type of DNS record maps host names to addresses?
- Mail Exchanger (MX) DNS record
- Service (SRV) DNS record
- Host (A) DNS record
- Canonical (CNAME) DNS record
Explanation:An A or Address record (also known as a host record) links a domain to the physical IP address of a computer hosting that domain’s services.
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Teredo tunneling is a protocol that:
- Translates Internet Protocol version 4 (IPv4) to Internet Protocol version 6 (IPv6).
- Allows IPv6 connectivity through IPv4 devices.
- Provides VPN security.
- Dynamically allocates IPv6 addresses.
Explanation:Teredo alleviates this problem by encapsulating IPv6 packets within UDP/IPv4 datagrams, which most NATs can forward properly. Thus, IPv6-aware hosts behind NATs can be used as Teredo tunnel endpoints even when they don’t have a dedicated public IPv4 address.
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What is the default subnet mask for a Class C Internet network?
- 255.255.255.252
- 255.255.255.240
- 255.255.255.192
- 255.255.255.0
Explanation: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.