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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. What information is stored in TCAM?
IEEE 802.3ae
Security and QoS ACLs
The switch port falls back to default setting of half duplex
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

2. Displays CEF Punt statistics with number of packets and reason for each line card
Switch#show cef not-cef-switched
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch#show cef drop
Value - Mask - and Result (VMR)

3. What is 100BASE-TX?
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Only temporarily for debugging purposes
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

4. Disables CEF operation globally
Switch(config)#errdisable detect cause unicast-flood
Multilayer Switching
Switch#show adjacency [{interface}] [summary | detail]
Switch(config)#no ip cef

5. Adds a description to an interface configuration
IEEE 802.3
SVI
Switch(config-if)#description {string}
Switch(config-if)#speed {10 | 100 | 1000 | auto}

6. Displays a list with status of all interfaces
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Switch#show interfaces status
The adjacency table
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

7. What information is recorded in CAM as frames arrive on a switch port?
Source MAC address; Port of arrival; VLAN; Time stamp
10GbE operates only at full duplex
The CEF epoch number
By Mask/Value - where each unique mask has eight value patterns associated with it

8. What is 1000BASE-T?
The Drop adjacency
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Route caching and topology based
Process the first packet in a traffic flow to determine the destination

9. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Wide-Wavelength Division Multiplexing
ANSI X3T11 FibreChannel
CEF punt

10. What are the Fast Ethernet autonegotiation selection priorities?
Only temporarily for debugging purposes
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Switch(config)#errdisable detect cause {all | {cause-name}}
IEEE 802.3ab

11. Displays error-disabled recovery timer information
The Null adjacency
Switch(config)#errdisable detect cause dtp-flap
Switch#show errdisable recovery
300 seconds

12. What are the common cabling specifications for Fast Ethernet?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config-if)#switchport access vlan {vlan}
Switch#show errdisable detect

13. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Switch(config)#errdisable detect cause dhcp-rate-limit
Trunk
R = LAN PHY; W = WAN PHY

14. What CEF adjacency is used to switch packets that can't be forwarded normally?
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
The Drop adjacency
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
10 km

15. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
Trunk or dynamic
SC or MT-RJ
A name assigned to a ranges of interfaces
Switch(config)#errdisable detect cause unicast-flood

16. What is a SVI?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Compiling Access Control Entries (ACE) into the TCAM table
Trunk or dynamic
Switched virtual interface (SVI)

17. What is unknown unicast flooding?
Switch(config)#errdisable detect cause unicast-flood
Switch(config)#errdisable detect cause {all | {cause-name}}
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

18. What is 10GBASE-CX4?
Switch(config-if)#no switchport
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
ANSI X3T11 FibreChannel
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

19. What is the name of physical network segment where data packets can collide with one another when being sent?
The Null adjacency
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch(config)#errdisable detect cause bpduguard
Collision domain

20. What CEF optimisation technique cache FIB entries in switch line cards?
Half duplex
Accelerated CEF (aCEF)
Numeric values that represent what action to take after the TCAM lookup occurs
Switch#show interfaces status err-disabled

21. What is the maximum cabling distance for 10GBASE-ER/EW?
40 km
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

22. What is the state of packets that are sent to the CEF Layer 3 engine because of missing Layer 2 next-hop addresses?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
CEF glean

23. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
SVI or native routed interface
R = LAN PHY; W = WAN PHY
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)
Slow response times - low throughput - runts and other input errors on the switch ports

24. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
The Drop adjacency
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)
In TCAM Value entries

25. What is the content of TCAM Result entries?
Numeric values that represent what action to take after the TCAM lookup occurs
IEEE 802.3z
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
IEEE 802.3

26. What is the standard for 10 Gigabit Ethernet (10GbE)?
Enable error-disable for all possible causes
IEEE 802.3ae
LAN PHY and WAN PHY
The table of learned MAC addresses - ports - and VLAN information

27. Enables error-disable detection
Switch(config)#default interface {interface}
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config-if)#duplex {auto | full | half}
The Layer 3 engine

28. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
Switch(config)#errdisable detect cause {all | {cause-name}}
The switch port falls back to default setting of half duplex
Wide-Wavelength Division Multiplexing
Multilayer Switching

29. What is 10BASE-T?
A three-fold combination of 0 - 1 and X (don't care)
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

30. What is CAM?
Switch(config)#errdisable detect cause dhcp-rate-limit
Content-Addressable Memory
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Switch#show adjacency [{interface}] [summary | detail]

31. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
Switch(config)#errdisable detect cause l2ptguard
S = Short; L = Long; E = Extra-long
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
The Drop adjacency

32. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
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
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch(config-if)#no switchport
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

33. What CEF optimisation replicates the entire FIB table among switch line cards?
Switched virtual interface (SVI)
Full duplex only
Switch(config)#errdisable detect cause psecure-violation
Distributed CEF (dCEF)

34. Enables automatic re-enabling of error-disabled ports
Switch(config)#errdisable detect cause security-violation
Half duplex
Switch(config)#interface range macro {name}
Switch(config)#errdisable recovery cause {all | {cause-name}}

35. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Switch(config)#mac address-table aging-time {seconds}
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
70 km for 9 micron SMF; 100 km for 8 micron SMF

36. What information is stored in CAM?
The table of learned MAC addresses - ports - and VLAN information
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config-if)#switchport access vlan {vlan}

37. What is the operational mode of a switch port that carries traffic for multiple VLANs?
Switch#show ip cef {interface} [detail]
Tunnel
Trunk
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

38. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
Distributed CEF (dCEF)
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Tunnel

39. What connectors can be used with GBIC modules?
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
SC fibre optic or RJ-45 UTP
American National Standards Institute
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed

40. Enables error-disable for errors with dynamic ARP inspection
Switch(config)#errdisable detect cause arp-inspection
The adjacency table
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Ternary Content-Addressable Memory

41. What combinations are TCAM entries composed of?
Full duplex only
Value - Mask - and Result (VMR)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

42. What is the maximum cabling distance for 1000BASE-LX/LH?
Wide-Wavelength Division Multiplexing
FIB with adjacency table
Switch(config-if)#switchport mode access
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

43. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
Store-and-forward
IEEE 802.3u
Switch(config)#errdisable detect cause dhcp-rate-limit

44. What is full duplex operation?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Static access or dynamic
XENPAK - X2 - or SFP+
Switch(config)#errdisable detect cause ilpower

45. What are GigaStack GBICs used for?
SC fibre optic or RJ-45 UTP
Cabling specifications for Gigabit Ethernet
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

46. What are the basic operations that a frame undergoes as it passes through a Layer 2 switch?
CEF glean
400 metres half duplex and 2000 metres full duplex
When one station transmits at the same time as another on a shared medium
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

47. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Route caching and topology based
Switch(config)#errdisable detect cause bpduguard
Institute of Electrical and Electronics Engineers
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

48. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
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)
Switch#show errdisable recovery
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Tunnel

49. When should CEF be disabled?
Only temporarily for debugging purposes
Switch#show interfaces status err-disabled
Numeric values that represent what action to take after the TCAM lookup occurs
Switched virtual interface (SVI)

50. How is the TCAM organised?
Static access or trunk
IEEE 802.3ab
By Mask/Value - where each unique mask has eight value patterns associated with it
Logical Operation Unit