Flashcards
Switches
Cards in this deck (44)
- 1These devices are in Layer 2 and are used to define collision domains with independent bandwidth on each port.(not Broadcast collisions)SWITCHES
- 2What are the 3 functions of a switch?1) Address Learning
2) Forward/Filter Decisions
3) Loop Avoidance - 3True or False: Switches rely on their MAC address Table (MAT) to make forwarding decisions.True
(part of Address Learning) - 4T or F: Frame Filtering is when the switch sends the frame out the port to the specific MAC address known in its MAT.True
- 5T or F: Frame Forwarding is when the switch does have the destination MAC address so it floods/sends the frame out all the ports minus the one it came in on .TRUE
- 6T or F: Loop avoidance is essentially avoided by using STP. if not used switches would forward endlessly causing network or device failureTrue
- 7What is the primary purpose of Spanning Tree Protocol (STP) IEEE 802.1d?to stop looping on switches
- 8STP communicates using which data units?Bridge Protocol Data Units (BPDU's)
- 9What are the STP port States (used to prevent looping)?1) Blocking
2) Listening
3) Learning
4) Forwarding
5) Disabled - 10What does the root bridge do?It is the main focal point of the network. it acts as a reference point for all other devices in the STP domain.
- 11What is a root port?shortest physical path to the root bridge
- 12True or false: Root bridges are chosen based on a election process, combining bridge priority and MAC addresses.True
(can be manipulated by administrator) - 13What is a Designated Port?Highest bandwidth to the root bridge
(not necessarily the shortest path, may go through other switches to get to the root bridge) - 14True or False: Every other port that is not a root or designated port is placed in a blocking state, preventing a bridge loopTrue
- 15What is Rapid STP (RSTP)?It is a standard developed to be a faster version of STP. basically STP is old 1985 and RSTP is modern version, essentially faster
- 16T or F: PVST and PVST+ simply treat each VLAN as a separate network and utilizes separate STP instanced for each VLAN configured on the network.True
- 17What trunking protocols do PVST and PSVT+ support?PVST= ISL
&
PVST+= 802.1Q - 18Why was port fast developed?developed as a means to speed up the transition process of delays caused by STP
- 19T or F: PortFast switch ports to immediately enter forwarding state, bypassing the STP listening and learning states. Since STP is used between switches access ports with workstations attached to them do not require STP.True
used for shit like DHCP - 20Physical Interfaces: What are the 3 main physical interfaces we care about for this MOD?1) serial/highspeed serial interface
2) Ethernet/FastEthernet/GigabitEthernet
3)ISDN - 21T of F: Serial interfaces are slower the Ethernet and can only support up to 150FT, (shorter than Ethernet)True
- 22Serial interfaces use what types of encapsulation methods?HDLC, PPP, Frame Relay and X.25
- 23T or F: Ethernet/FastEthernet/GigabitEthernet are forward and backword compatible.True
- 24What encapsulation method is utilized for Ethernet?ARPA (advanced research Projects Agency) which means the encapsulation being utilized is Ethernet II.
- 25non modular router =E0
- 26modular device =E 0/0
- 27for a router: F 0/0 what do each 0 represent?F 0/0
0 on the left= first slot
0 on the right=first port - 28for a router: F 0/0/0 what do each 0 represent?F 0/0/0
0 on the left= first module
0 in the middle=slot
0 on the right=first port - 29for a switch: F 0/1 reps the first port. but when 2 switches are stacked: F 1/1 the left 1 means the second switch 1st portYUP
- 30Virtual Interfaces: This is a virtual interface that uses a parent physical interface, allowing for network expansion despite a limited number of physical interfaces.Sub-Interface
Example:
Ethernet 0/1.1
**decimal is the key here - 31Virtual Interfaces: This virtual interface utilized to cloak or hide data within another dissimilar or similar protocol. Uses GRE general routing encapsulationTunnel
- 32Virtual Interfaces: This interface configured on the router, utilized for maintenance.management functions. Commonly configured to provide IP address when utilizing an ipunumbering schemaLooping
- 33Virtual Interface: this interface provides an alternative method of filtering traffic. A cliff to push unwanted network trafficNULL
- 34Switches: F 1/0/1 F 2/0/1Routers:
non-modular= S 0
Modular= S 0/0 - 35What are the four steps of the STP process?1) elect a root bridge
3) all other switches find their designated ports
4) all other ports that are not root or designated are put in the blocking state - 36Where is the CISCO IOS stored?Stored in (EEPROM) FLASH Memory
- 37List 3 ways to access the CISCO IOS?1) console port
2) auxiliary port
3) VTY Lines - 38This STP makes STP convergence quicker and works with Hello times...RSTP
Rapid STP - 39What command is entered to apply type 7 encryption on all visible passwords?service password-encryption
- 40What command is used to view VLAN info and port status on a switch?show vlan brief
- 41True or False: A Trunk port is a 100-1000 Mbps point-point link between switches or between a switch and a router.True
- 42T or F: Access ports are for one VLAN and Trunk ports are for multiple VLANS.True
- 43What are the 2 trunking protocols?1) ISL = adds 30 bytes to the header and is CISCO proprietary
2) 802.1q=adds 4 bytes to the header - 44how do you break down the 4 bytes added to the header for dot1q trunking protocol? 81 00 00 0Aso...
81 00 designated the next protocol (dot1q)
then...
the first 0 in the 3rd byte reps the priority (0-7) and the last 3 nibbles (12 bits) rep the VLAN ID. **must covert hex to Decimal
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- college Enterprise Networking (Switches) Flashcards on Switches, created by jeriel.juarbe2031 on 06/09/2014.
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- jeriel.juarbe2031
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