CS fundamentals networking questions
Class A default mask:
255.0.0.0 or a/8
Class C default mask:
255.255.255.0 or a/24
What is the maximum number of hosts that a network with a subnet mask of /26 can have?
62
Which one of the following statements best describes the purpose of a default route?
A default route is an optional entry that is used when no explicit path to a destination is found in the routing table
Which two of the following statements are true regarding the hub?
All ports on the hub are in the same single collision domain & hubs can run only in half-duplex mode
Which one of the following statements best describes a lightweight access point (LWAP)?
An LWAP is part of a unified wireless access system where a centralized wireless LAN controller manages the administrative functions of network access
Which one of the following options is the routing protocol that is used between the major ISPs?
BGP
distance-vector protocols
Each router determines the best path on its own **'Distance Determines'** :)
Which one of the following statements best describes how 802.1q incorporates VLAN information onto an Ethernet frame?
It inserts a 4-byte header after the source MAC address in the original Ethernet frame, which carries the VLAN information
Which one of the following best describes how a switch processes the traffic, if the switch does not have the MAC address of an endpoint in the MAC address table, and it receives a frame that is destined for that device?
It will flood the frame out all ports, except the one that it arrived on within the VLAN
If a switch receives a frame for an endpoint whose MAC address exists in the MAC address table, how does it process the traffic?
It will forward the frame out of the identified port in the table and filter transmission to all other ports
Which one of the following options does the established keyword in an ACL entry indicate?
Reply packets that belong to an established TCP connection will be permitted if the TCP packet has the ACK or RST bit set
path-vector protocols
Routers are familiar with the direction and path to the destination.
Which two of the following statements are true regarding a network that uses subnetworks?
Smaller networks are easier to manage, Overall broadcast traffic is reduced
Which one of the following best describes how VLANs improve network performance?
VLANs separate a large broadcast domain into smaller broadcast domains
Which one of the following options best describes the function of the root bridge in a spanning tree protocol?
a reference point, the logical center
Which one of the following options best describes the role of the DHCP relay agent in a network infrastructure?
acts as a "middle man" to forward DHCP requests to a designated remote DHCP server
Which one of the following options is the implicit ACL entry that is at the end of the ACL?
deny ip any any
link-state protocols
does not have an actual map of the network topology
Which four of the following options are benefits of using LWAPs and a unified wireless solution?
flexible client roaming, dynamic client load balancing, security management, & wireless intrusion protection system
The primary function of a DHCP relay agent:
is to relay the DHCP messages from the local DHCP clients to the remote DHCP servers
When the DHCP relay agent receives a broadcast packet from a connected client:
it changes the giaddr field from zero to the relay agent IP address, and forwards the message to the DHCP server
Which two of the following statements are true regarding an autonomous access point?
self-contained, one or more functional BSSs, & can operate without the use of a centralized controller
Which one of the following options is most used by multilayer switches to allow for wire-speed switching?
specialized ASIC hardware
172.16.55.87 /20
tells you that the first 20 buts are the network address, and the remaining 12 are for the host portion (/20 is also expressed as 255.255.240.0)
When using DHCP with IP phones, what is option 150 used for?
to supply the TFTP server IP address for image download