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Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Distributed CEF (dCEF)
SC or MT-RJ
Switch(config)#errdisable detect cause bpduguard

2. Displays the contents of the CAM table
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
The CEF entry version number
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

3. What is the operational mode of a switch port that carries traffic for multiple VLANs?
SVI or native routed interface
The CEF epoch number
Trunk
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

4. How are MAC addresses shown in the detailed output from the CEF adjacency table?
1 -2 on one end with 3 -6 on the other end
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
10 km
Down - static access - trunk or tunnel

5. What is the DTP negotiation mode of a switch port configured as trunk?
Switch#show ip cef {interface} [detail]
On
Switch#show interfaces {interface} switchport
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

6. What is the name of physical network segment where data packets can collide with one another when being sent?
Switch(config-if)#description {string}
Store-and-forward
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Collision domain

7. Removes entries from the CAM table
Switch(config)#errdisable detect cause {all | {cause-name}}
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
American National Standards Institute

8. What is the TCAM Value and Mask for an IPX access list?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config)#errdisable detect cause rootguard
In TCAM Value entries
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

9. What is the original standard for Ethernet (10 Mbps)?
IEEE 802.3
Switch(config-if)#no switchport
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show running-config interface {interface}

10. What is the TCAM Value and Mask for an Ethernet access list?
Route caching and topology based
CEF punt
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

11. Displays a list of all interfaces in an error-disabled state
Packets that have been truncated before they were fully received
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Enable error-disable for all possible causes
Switch#show interfaces status err-disabled

12. Enables error-disable for the presence of invalid GBIC or SFP modules
Switch(config)#errdisable detect cause gbic-invalid
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
Switch(config)#errdisable detect cause ilpower
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

13. Displays a list with status of all interfaces
Source MAC address; Port of arrival; VLAN; Time stamp
Switch#show interfaces status
Process the first packet in a traffic flow to determine the destination
SVI or native routed interface

14. Enables error-disable detection
Switch(config)#errdisable detect cause {all | {cause-name}}
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
The adjacency table

15. What is the standard for 1000BASE-T?
Switch(config)#errdisable detect cause channel-misconfig
Compiling Access Control Entries (ACE) into the TCAM table
IEEE 802.3ab
The Discard adjacency

16. What is the TCAM Value and Mask for an IGMP access list?
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show interfaces status
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX

17. What are the reasons for packets being dropped by CEF?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
1000BASE-T full duplex followed by 1000BASE-T half duplex
Value - Mask - and Result (VMR)

18. What function is performed by the Feature Manager (FM)?
Compiling Access Control Entries (ACE) into the TCAM table
IEEE 802.3
IEEE 802.3ae
Switch(config)#default interface {interface}

19. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
The table of learned MAC addresses - ports - and VLAN information
Feature Manager (FM) and Switching Database Manager (SDM)
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
XENPAK - X2 - or SFP+

20. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch(config-if)#shutdown
With a mask value in addition to binary values to decide which keys in a table are relevant

21. Enables error-disable when a storm control threshold has been exceeded on a port
15 metres
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#errdisable detect cause storm-control
Switch(config)#errdisable detect cause unicast-flood

22. What is 10GBASE-SR/SW?
Switch(config)#errdisable detect cause unicast-flood
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
SVI

23. What is the TCAM Value and Mask for an IP access list?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Off
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
The Layer 3 forwarding engine

24. How is the TCAM organised?
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
By Mask/Value - where each unique mask has eight value patterns associated with it
Switch(config)#mac address-table aging-time {seconds}
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

25. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
The Drop adjacency
Switch(config)#errdisable detect cause arp-inspection

26. What is TCAM overflow?
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
400 metres half duplex and 2000 metres full duplex
10 km
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

27. What are the duplex modes of a GigaStack GBIC?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch#show interfaces {interface}
Source MAC address; Port of arrival; VLAN; Time stamp
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

28. What is CEF?
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Cisco Express Forwarding
Full duplex

29. What is LAN PHY used for?
Value - Mask - and Result (VMR)
Interconnecting switches in a campus network
40 km
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache

30. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Switch(config-if)#no switchport
Switch#show interfaces {interface}
Switch(config)#errdisable detect cause security-violation
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

31. Enables automatic re-enabling of error-disabled ports
Switch(config-if)#description {string}
300 seconds
Switch#show errdisable recovery
Switch(config)#errdisable recovery cause {all | {cause-name}}

32. When can a switch start to learn source MAC addresses on incoming ports?
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Switch(config)#errdisable detect cause gbic-invalid

33. What is 1000BASE-ZX?
ANSI X3T11 FibreChannel
Tunnel
Switch#show adjacency [{interface}] [summary | detail]
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

34. Displays the entire Forwarding Information Base (FIB)
Switch(config-if)#switchport mode access
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch#show ip cef
American National Standards Institute

35. What is ANSI?
Switch(config)#errdisable detect cause rootguard
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
American National Standards Institute
Feature Manager (FM) and Switching Database Manager (SDM)

36. What is Fast EtherChannel (FEC)?
The Null adjacency
Feature Manager (FM) and Switching Database Manager (SDM)
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

37. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

38. What is the operational mode of a switch port that is a member of one VLAN?
Static access
IEEE 802.3ae
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch(config)#interface range macro {name}

39. What is unknown unicast flooding?
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Content-Addressable Memory
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

40. What is error-disable state?
A switch port that has been shut down automatically due to a serious error condition
300 seconds
Collision domain
Switch(config-if)#no ip route-cache cef

41. What is 10GBASE-LX4/LW4?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Static access
The Discard adjacency

42. What CEF adjacency is used to discard packets because of access list or other policy action?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
The Discard adjacency
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
A name assigned to a ranges of interfaces

43. What is full duplex operation?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

44. What is the content of TCAM Result entries?
Switch(config-if)#duplex {auto | full | half}
CEF punt
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Numeric values that represent what action to take after the TCAM lookup occurs

45. What is 10GBASE-ER/EW?
Switch(config)#errdisable detect cause dhcp-rate-limit
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Ternary Content-Addressable Memory
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)

46. What are the basic operations that a frame undergoes as it passes through a Layer 2 switch?
Switch(config-if)#no switchport
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
IEEE 802.3
Forwarding Information Base

47. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
XENPAK - X2 - or SFP+
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
10 km
Switch(config)#default interface {interface}

48. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Store-and-forward
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch#show ip cef {interface} [detail]
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

49. What is 10GBASE-CX4?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Static access
CEF punt
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

50. Displays administrative and operational status for a specified interface
Switch#show interfaces {interface}
Forwarding Information Base
On
Switch(config-if)#speed {10 | 100 | 1000 | auto}