network services Flashcards
A DHCPDISCOVER message uses which traffic type?
Discover (Broadcast)
Offer (unicast)
Request (Broadcast)
Acknowledge (Unicast).
Which tunneling protocol can be used to dynamically form new tunnels and connect branch offices together securely?
DMVPN (Dynamic Multipoint Virtual Private Network) is a protocol used to dynamically form tunnels between sites securely. DMVPN relies on protocols such as IPSec for security, mGRE (multipoint Generic Route Encapsulation) as a protocol that encapsulates and forms tunnels, and NHRP (Next Hop Resolution Protocol) a protocol used to resolve IP addresses.
NHRP
Next Hop Resolution Protocol (NHRP) is an automated configuration technology that routes data on a distributed network by discovering the best routing path between endpoints. It enables a computer sending data to another computer to learn the most direct route – the fewest number of hops – to the receiving computer.
You are configuring a new DHCP server for your company. You need to configure a time range in which a host can keep its assigned address before releasing it. What is the name of the value that you should configure on the DHCP server?
A lease time is configured under a DHCP (Dynamic Host Configuration Protocol) server to provide a time range in which a host can keep its address before releasing it back to the DHCP pool.
Which technology can only operate through the line of sight?
R (Infrared) is a type of wave that is invisible to the human eye and its ability to operate is only line of sight. Devices that use IR include TV remotes.
LLDP
link Layer Discovery Protocol) is a layer 2 protocol used to advertise system information and to discover neighbors within the same link.
You are configuring a DHCP server on a separate subnet than where the hosts requesting the addresses lie. What should you configure so that the DHCP communication between the server and the clients can be successful?
Layer 3 interfaces prevent broadcasts from being passed, as they break up broadcast domains. DHCP (Dynamic Host Configuration Protocol) relies on Broadcast messages for communication, so with DHCP relay, it rewrites the source address from a node as a unicast address. This allows for a DHCP server to lie on a different subnet than a node that requires DHCP services.
Keith, a VoIP engineer, needs to migrate all of the phone systems in the company to use internet only communication instead of facilitating phone calls through traditional telephone lines. Which of the following service types should the PBX support?
SIP (Session Initiation Protocol) trunking allows a PBX (Private Branch Exchange) to send voice calls over a packetized network, such as the internet.
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Which L2 protocol transfers data in fixed cells of 53 bytes?
ATM (Asynchronous Transfer Mode) is a technology used by service providers to switch data using fixed cells of 53 bytes.
MPLS (MultiProtocol Label Switching) is a Service Provider technology used to switch data based on labels, instead of addresses.
Frame Relay is a layer 2 protocol that specifies the framing and structure of Frame Relay frames on the perspective WAN (Wide Area Network) network.
PPP (Point to Point Protocol) is a layer 2 encapsulation protocol that provides features such as authentication and compression, typically used on WAN (Wide Area Network) links.
Joey, a network technician, has been asked to implement a solution in which computers in the internal network, using one public address, can communicate with other computers out on the internet. Which of the following should Joey configure?
PAT allows multiple devices to use a single Public IP address because PAT uses port numbers to correspond to each host.
You are looking to buy some home automation devices for your home. Which of the following protocols might you see be used on these devices?
ANT+ and Z-Wave are wireless protocols used in fitness devices, television sets, and indoor lighting sets.
