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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. Enables automatic re-enabling of error-disabled ports
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Switch(config)#errdisable recovery cause {all | {cause-name}}
The CEF entry version number

2. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
Switch#show cef drop
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Switch(config)#mac address-table aging-time {seconds}
The switch port falls back to default setting of half duplex

3. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Off
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch(config)#errdisable detect cause pagp-flap

4. What is half duplex operation?

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5. Enables error-disable for the presence of invalid GBIC or SFP modules
Switch(config)#errdisable recovery cause {all | {cause-name}}
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
Switch(config)#errdisable detect cause gbic-invalid

6. What is the TCAM Value and Mask for an IPX access list?
With a mask value in addition to binary values to decide which keys in a table are relevant
In parallel revealing the best (longest) match in a single table lookup
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Full duplex

7. Specifies the timer for automatic re-enabling of error-disabled ports
Switch#show ip cef
S = Short; L = Long; E = Extra-long
By Mask/Value - where each unique mask has eight value patterns associated with it
Switch(config)#errdisable recovery interval {seconds}

8. What is the maximum cabling distance for 1000BASE-ZX?
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
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause channel-misconfig

9. Displays a list with status of all interfaces
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
Switch#show interfaces status
Process the first packet in a traffic flow to determine the destination
25 metres

10. Enables error-disable for errors with dynamic ARP inspection
The Null adjacency
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch(config)#errdisable detect cause arp-inspection
ANSI X3T11 FibreChannel

11. How is link speed determined on Fast Ethernet links configured to autonegotiate?
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch(config)#errdisable detect cause pagp-flap
A station must wait its turn to transmit; it can't transmit and receive at the same time
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

12. Disables CEF operation on an interface
Switch(config-if)#no ip route-cache cef
SC or MT-RJ
Switch(config)#errdisable detect cause arp-inspection
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

13. What is 100BASE-T2?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Accelerated CEF (aCEF)
Switch#show errdisable detect
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

14. What are the operational modes of a Layer 2 switched interface?
25 metres
Down - static access - trunk or tunnel
Static access or dynamic
Trunk or dynamic

15. What is LAN PHY used for?
Switch(config)#errdisable recovery interval {seconds}
Interconnecting switches in a campus network
Store-and-forward
American National Standards Institute

16. What information is stored in CAM?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
The table of learned MAC addresses - ports - and VLAN information
40 km
The adjacency table

17. What is the TCAM Value and Mask for an IGMP access list?
With a mask value in addition to binary values to decide which keys in a table are relevant
Accelerated CEF (aCEF)
Switch(config)#errdisable detect cause channel-misconfig
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

18. Creates an interface-range macro
Switch(config)#interface {type}{module}/{number}
Switch(config)#mac address-table aging-time {seconds}
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

19. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch(config-if)#speed {10 | 100 | 1000 | auto}
10 km
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

20. Enables error-disable when an interface has been looped back
Switch(config)#errdisable detect cause loopback
The table of learned MAC addresses - ports - and VLAN information
They are dropped (ARP throttling)
By Mask/Value - where each unique mask has eight value patterns associated with it

21. What is IEEE?
400 metres half duplex and 2000 metres full duplex
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Institute of Electrical and Electronics Engineers
Static access - trunk - tunnel or dynamic

22. What is the state of packets that are sent to the CEF Layer 3 engine because of missing Layer 2 next-hop addresses?
Switch(config-if)#no switchport
CEF glean
Store-and-forward
Switch(config)#interface {type}{module}/{number}

23. What is the default timer for automatic re-enabling of error-disabled ports?
Institute of Electrical and Electronics Engineers
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Switch#show errdisable recovery
300 seconds

24. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
The adjacency table
Electromagnetic Interference
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
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

25. What is the maximum cabling distance for 1000BASE-LX/LH?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config)#errdisable detect cause rootguard
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

26. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
400 metres half duplex and 2000 metres full duplex
The Drop adjacency
Down - static access - trunk or tunnel
The Layer 3 engine

27. Enables error-disable for when the port link state is flapping between the up and down states
Switch(config)#errdisable detect cause link-flap
Off
300 seconds
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

28. Enables error-disable for errors with offering inline power
Accelerated CEF (aCEF)
Switch(config)#errdisable detect cause ilpower
SC fibre optic or RJ-45 UTP
Cisco Express Forwarding

29. What are GigaStack GBICs used for?
Cabling specifications for Gigabit Ethernet
Switch#show errdisable recovery
Switch(config)#errdisable detect cause udld
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

30. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Store-and-forward
LOU registers
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

31. Resets the configuration of a switch port to its default values
Switch(config)#default interface {interface}
Switch(config-if)#switchport access vlan {vlan}
Switch(config)#errdisable detect cause {all | {cause-name}}
25 metres

32. What tables are maintained by the CEF Layer 3 engine?
Routing table and ARP table
Switch#show running-config interface {interface}
They are dropped (ARP throttling)
Slow response times - low throughput - runts and other input errors on the switch ports

33. What is FIB?
The adjacency table
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Forwarding Information Base
15 metres

34. How are ports that are in error-disable state re-enabled by default?
Manually by administratively disabling and re-enabling the port
Tunnel
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
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

35. What tables are maintained by the CEF Layer 3 forwarding engine?
Switch(config)#errdisable detect cause l2ptguard
The table of learned MAC addresses - ports - and VLAN information
Tunnel
FIB with adjacency table

36. What function is performed by the Switching Database Manager (SDM)?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
SC fibre optic or RJ-45 UTP
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

37. What is 100BASE-FX?
Switch#show interfaces status err-disabled
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
70 km for 9 micron SMF; 100 km for 8 micron SMF

38. What is 10GBASE-ER/EW?
Source MAC address; Port of arrival; VLAN; Time stamp
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch(config)#mac address-table aging-time {seconds}
Only temporarily for debugging purposes

39. Selects a switch port interface and enters interface configuration mode
Switch(config)#interface {type}{module}/{number}
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch(config)#errdisable detect cause ilpower
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

40. What is 10GBASE-LX4/LW4?
Interconnecting switches in a campus network
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Multilayer Switching
Collision domain

41. What are the Gigabit Ethernet autonegotiation selection priorities?
A station must wait its turn to transmit; it can't transmit and receive at the same time
40 km
Store-and-forward
1000BASE-T full duplex followed by 1000BASE-T half duplex

42. What packets are immediately sent to the CEF Layer 3 engine for further processing?

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43. Displays error-disabled recovery timer information
CEF glean
SVI or native routed interface
A three-fold combination of 0 - 1 and X (don't care)
Switch#show errdisable recovery

44. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
LC - MT-RJ or RJ-45
Switch(config)#errdisable detect cause l2ptguard
Logical Operation Unit
Full duplex only

45. How do Layer 2 switches provide isolation between hosts?
Content-Addressable Memory
Value - Mask - and Result (VMR)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

46. Displays the CAM table size with number of MAC addresses
Switch(config)#errdisable detect cause security-violation
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Store-and-forward
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

47. What are the names of CEF optimisation techniques using specialised forwarding hardware?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Process the first packet in a traffic flow to determine the destination
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch(config)#errdisable detect cause loopback

48. What CEF optimisation replicates the entire FIB table among switch line cards?
Multilayer Switching
10 km
Distributed CEF (dCEF)
The Null adjacency

49. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
10GbE operates only at full duplex
Dynamic
Switch#show running-config interface {interface}
Interconnecting switches in a campus network

50. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
Switch(config)#errdisable detect cause pagp-flap
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Switch(config)#errdisable detect cause rootguard
Cisco Express Forwarding