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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 is the maximum cabling distance for 1000BASE-CX?
Switch(config)#interface vlan {vlan-id}
IEEE 802.3z
25 metres
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets

2. What are the reasons for packets being punted by CEF?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
They are dropped (ARP throttling)
From 30 seconds to 86 -400 seconds (24 hours)
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

3. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
100 metres
XENPAK - X2 - or SFP+
Switch#show cef drop
The Layer 3 forwarding engine

4. Adds a static entry to the MAC address table
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
300 seconds
Switch(config)#errdisable detect cause bpduguard

5. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
The CEF epoch number
Native routed interface
The adjacency table
Switch(config-if)#no switchport

6. Enables error-disable for the presence of invalid GBIC or SFP modules
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch#show ip cef {interface} [detail]
Switch(config)#errdisable detect cause rootguard
Switch(config)#errdisable detect cause gbic-invalid

7. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
CEF glean
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Packets that have been truncated before they were fully received
Switch(config-if)#no switchport

8. What is the default timer for automatic re-enabling of error-disabled ports?
Static access
Dynamic
Switch(config)#errdisable detect cause security-violation
300 seconds

9. Enables error-disable for conditions that trigger port security configured on a port
Switch(config)#errdisable detect cause psecure-violation
SC fibre optic or RJ-45 UTP
A station must wait its turn to transmit; it can't transmit and receive at the same time
Switch(config)#errdisable detect cause ilpower

10. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Configure the appropriate values manually on both ends of the link
Route caching and topology based
By Mask/Value - where each unique mask has eight value patterns associated with it

11. How is link speed determined on Fast Ethernet links configured to autonegotiate?
Static access
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
10GbE operates only at full duplex
Switch(config)#errdisable detect cause psecure-violation

12. Sets the duplex mode of an Ethernet or Fast Ethernet interface
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch(config-if)#duplex {auto | full | half}
Switch(config)#errdisable detect cause arp-inspection
1000BASE-T full duplex followed by 1000BASE-T half duplex

13. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
When one station transmits at the same time as another on a shared medium
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Store-and-forward

14. What is a GigaStack GBIC?
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
LC - MT-RJ or RJ-45
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
400 metres half duplex and 2000 metres full duplex

15. What is ANSI?
American National Standards Institute
Forwarding Information Base
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Down - static access - trunk or tunnel

16. How are ternary combinations implemented?
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch(config)#default interface {interface}
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
With a mask value in addition to binary values to decide which keys in a table are relevant

17. What is 10GBASE-LR/LW?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Cabling specifications for Gigabit Ethernet
Switch(config)#errdisable detect cause gbic-invalid

18. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
10 km
IEEE 802.3
Route caching and topology based
Switch(config-if)#shutdown

19. Removes entries from the CAM table
Switch(config)#errdisable detect cause psecure-violation
CEF punt
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
By Mask/Value - where each unique mask has eight value patterns associated with it

20. What is 10GBASE-CX4?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Down - static access - trunk or tunnel
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

21. What is the default duplex mode of a Fast Ethernet interface?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Dynamic
Half duplex

22. What is the maximum cabling distance for 1000BASE-LX/LH?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config-if)#switchport mode access
400 metres half duplex and 2000 metres full duplex
R = LAN PHY; W = WAN PHY

23. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Configure the appropriate values manually on both ends of the link
1000BASE-T full duplex followed by 1000BASE-T half duplex
Switch(config)#errdisable detect cause bpduguard
Routing table and ARP table

24. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Switch(config)#interface range macro {name}
Switch(config)#errdisable detect cause link-flap
Switch(config)#errdisable detect cause vmps

25. What are GigaStack GBICs used for?
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Switch(config)#errdisable detect cause unicast-flood
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

26. What is the maximum cabling distance for 10GBASE-ER/EW?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
40 km
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
With a mask value in addition to binary values to decide which keys in a table are relevant

27. Sets the administrative mode of a switch port to access
Switch(config-if)#switchport mode access
Switch(config)#errdisable detect cause l2ptguard
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
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

28. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Content-Addressable Memory
Switch(config-if)#description {string}

29. Displays error-disabled detection status
Switch#show errdisable detect
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

30. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
Switch(config)#errdisable detect cause rootguard
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config-if)#duplex {auto | full | half}
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

31. Specifies the timer for automatic re-enabling of error-disabled ports
Switch(config)#errdisable recovery interval {seconds}
The Layer 3 forwarding engine
Store-and-forward
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

32. What is the state of packets that are sent to the CEF Layer 3 engine because of missing Layer 2 next-hop addresses?
CEF glean
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
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 udld

33. How is the TCAM organised?
By Mask/Value - where each unique mask has eight value patterns associated with it
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
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
Static access or dynamic

34. What is LAN PHY used for?
IEEE 802.3
Switch(config)#interface {type}{module}/{number}
Interconnecting switches in a campus network
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

35. What is MLS?
Switch#show interfaces status
Multilayer Switching
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Creating the VLAN

36. What is the prerequesite for creating a working SVI?
Multilayer Switching
Creating the VLAN
Electromagnetic Interference
The table of learned MAC addresses - ports - and VLAN information

37. What is TCAM overflow?
With a mask value in addition to binary values to decide which keys in a table are relevant
Switched virtual interface (SVI)
1000BASE-T full duplex followed by 1000BASE-T half duplex
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

38. What are the reasons for packets being dropped by CEF?
Down - static access - trunk or tunnel
A name assigned to a ranges of interfaces
300 seconds
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

39. What is the DTP negotiation mode of a switch port configured as trunk?
The CEF entry version number
Half duplex
With a mask value in addition to binary values to decide which keys in a table are relevant
On

40. Displays the contents of the CAM table
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Dynamic
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter

41. What is the operational mode of a switch port that uses DTP negotiation?
Static access or trunk
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

42. What are the operational modes of a Layer 2 switched interface?
Down - static access - trunk or tunnel
With a mask value in addition to binary values to decide which keys in a table are relevant
The Drop adjacency
Switch(config)#errdisable detect cause l2ptguard

43. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
Tunnel
Switch(config)#errdisable recovery cause {all | {cause-name}}
Institute of Electrical and Electronics Engineers
From 30 seconds to 86 -400 seconds (24 hours)

44. What is 1000BASE-CX?
With a mask value in addition to binary values to decide which keys in a table are relevant
XENPAK - X2 - or SFP+
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
IEEE 802.3

45. What is the maximum cabling distance for 1000BASE-SX?
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#errdisable detect cause dtp-flap
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

46. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
The Discard adjacency
Switch(config)#errdisable detect cause loopback
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
100 metres

47. When do collisions occur?
Switch#show interfaces status
When one station transmits at the same time as another on a shared medium
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
Content-Addressable Memory

48. What are the default error-disable detection causes?
Switch(config)#errdisable detect cause vmps
Static access - trunk - tunnel or dynamic
Enable error-disable for all possible causes
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

49. Disables a switch port
Switch(config-if)#shutdown
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Static access

50. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
The switch port falls back to default setting of half duplex
Switched virtual interface (SVI)