Network+ Flashcards
What device operates at Layer 1 of the OSI model?
A hub operates at Layer 1 and moves bits, ignoring addressing.
What WAN topology uses the formula n(n-1)/2 to calculate the number of links required?
Full Mesh
What topology features a central location that connects to each remote connection but does not feature connections between those remote locations directly?
Hub-and-Spoke
NetBIOS is associated with which layer of the OSI model?
Session
What is the protocol data unit name for data at Layer 2?
Frame
Who developed the TCP/IP Stack network reference model (also known as the TCP/IP Model)?
DoD. The Department of Defence developed the TCP/IP Stack, which is a network reference model consisting of the following layers (From Bottom UP) : Network Interface, Internet, Transport, and Application. The International Standards Organization (ISO), developed the Open Systems Interconnect (OSI) Model.
Which of the following protocols resolves an IP address of a network device to a corresponding MAC address?
ARP
Which of the following is a primary benefit of a VPN concentrator??
It allows traffic to travel securely over an untrusted network
Which of the following DNS record types is an alias of an existing record?
CNAME
What is the technology used in an Ethernet network that features a backoff timer?
CSMA/CD. CSMA/CD permits multiple systems on an Ethernet network to communicate. Collisions, if they occure, are detected and systems retransmit. This is different from CSMA/CA, which seeks to avoid collisions altogether. Wireless networks typically feature a CSMA/CA approach and half-duplex communications.
What device in an STP domain features all ports in a Designated state?
Root Bridge
The root bridge is the root of the spanning-tree domain. All of its ports are forwarding and in the Designated state. All other options here do not exist in STP.
Host A (with an IP address of 10.1.2.3) sends a packet to Host B (with an IP address of 192.168.1.2). What type of data flow does this represent?
Unicast. With a unicast transmission, a packet travels from a single host to a single host. With a multicast transmission, a packet travels from a single host to all members of a multicast group. With a broadcast transmission, a packet travels from a single host to all hosts in a subnet. An anycast transmission is an IPv6 data flow, where a packet travels from a single source to a single destination. However, multiple devices could share the destination’s IP address, and the packet is routed to the host nearest to the source, from the perspective of a router’s routing table.
What is the correct formula for the calculation of the number of hosts that can exist on a given subnet?
2^h – 2
The number of hosts that can be accommodated on a subnet is calculated with the formula 2^h – 2. h is the number of host bits. The –2 is due to the broadcast address for the subnet and the subnet address itself.
What is the name of the process that is used in IPv6 address autoconfiguration to form a host ID?
When a device uses IPv6 address autoconfiguration, it often uses the EUI-64 process to take a device’s interface MAC address and alter it to form a 64-bit host ID.
