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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 are the Gigabit Ethernet autonegotiation selection priorities?
CEF punt
The CEF epoch number
1000BASE-T full duplex followed by 1000BASE-T half duplex
Switch(config)#errdisable recovery interval {seconds}

2. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
CEF glean
Switch(config)#errdisable detect cause dtp-flap
Tunnel
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

3. What is CAM?
Content-Addressable Memory
Switch(config)#default interface {interface}
Cabling specifications for Gigabit Ethernet
Switch(config)#errdisable detect cause psecure-violation

4. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
Switch(config-if)#switchport mode access
IEEE 802.3ae
S = Short; L = Long; E = Extra-long
Half duplex

5. How does topology based switching work?
Only temporarily for debugging purposes
They are dropped (ARP throttling)
ANSI X3T11 FibreChannel
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

6. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Static access
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Off

7. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
R = LAN PHY; W = WAN PHY
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Static access - trunk - tunnel or dynamic
Institute of Electrical and Electronics Engineers

8. What is half duplex operation?

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9. What information is stored in CAM?
Tunnel
The table of learned MAC addresses - ports - and VLAN information
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)#errdisable detect cause pagp-flap

10. What combinations are TCAM entries composed of?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
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
Value - Mask - and Result (VMR)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

11. Enables error-disable for rate-limiting of DHCP snooping
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config)#errdisable recovery interval {seconds}
Wide-Wavelength Division Multiplexing
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

12. What CEF adjacency is used to discard packets because of access list or other policy action?
Cisco Express Forwarding
Switch#show cef drop
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
The Discard adjacency

13. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Store-and-forward
The adjacency table
10GbE operates only at full duplex

14. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
In TCAM Value entries
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Switch(config)#errdisable detect cause rootguard
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

15. What are the operational modes of a Layer 2 switched interface?
SVI or native routed interface
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Down - static access - trunk or tunnel

16. What is 100BASE-T4?
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Switch(config-if)#no switchport
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

17. What are runts?
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
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Packets that have been truncated before they were fully received
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

18. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
Collision domain
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch(config)#errdisable detect cause rootguard
The CEF entry version number

19. What is 100BASE-FX?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Distributed CEF (dCEF)
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

20. When can a switch start to learn source MAC addresses on incoming ports?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause pagp-flap
Switch(config)#errdisable detect cause l2ptguard

21. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
LOU registers
Switch#show errdisable detect
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
Content-Addressable Memory

22. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
Switch#show interfaces status
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
CEF punt
Store-and-forward

23. What happens to subsequent packets destined for FIB entries in CEF glean state?
They are dropped (ARP throttling)
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
300 seconds
The table of learned MAC addresses - ports - and VLAN information

24. What is MLS?
From 30 seconds to 86 -400 seconds (24 hours)
Multilayer Switching
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
Creating the VLAN

25. Enables error-disable for misconfiguration of EtherChannel bundles
Store-and-forward
15 metres
LOU registers
Switch(config)#errdisable detect cause channel-misconfig

26. What is the DTP negotiation mode of a switch port configured as static access?
Switch(config)#errdisable detect cause psecure-violation
Carrier Sense Multiple Access Collision Detection
Off
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

27. Displays interface configuration information
The Drop adjacency
Switch#show running-config interface {interface}
Process the first packet in a traffic flow to determine the destination
1000BASE-T full duplex followed by 1000BASE-T half duplex

28. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
Trunk or dynamic
Feature Manager (FM) and Switching Database Manager (SDM)
Carrier Sense Multiple Access Collision Detection
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

29. What is the default duplex mode of a Fast Ethernet interface?
On
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)
Half duplex
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

30. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Switch(config)#interface range macro {name}
Switch#show interfaces status
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

31. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Dynamic
XENPAK - X2 - or SFP+
Creating the VLAN

32. How are ports that are in error-disable state re-enabled by default?
Content-Addressable Memory
100 metres
SC fibre optic or RJ-45 UTP
Manually by administratively disabling and re-enabling the port

33. What is error-disable state?
Half duplex
Dynamic
A switch port that has been shut down automatically due to a serious error condition
Tunnel

34. Disables a switch port
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Full duplex
Switch(config-if)#shutdown
Switch(config)#errdisable detect cause {all | {cause-name}}

35. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Switch(config)#errdisable detect cause bpduguard
Enable error-disable for all possible causes
Switch(config)#errdisable detect cause pagp-flap
Switch#show cef drop

36. What function is performed by the Feature Manager (FM)?
Compiling Access Control Entries (ACE) into the TCAM table
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config-if)#duplex {auto | full | half}
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

37. What is the maximum cabling distance for 1000BASE-CX?
Switch#show ip cef
Switch#show cef drop
Electromagnetic Interference
25 metres

38. Enables error-disable for conditions that trigger port security configured on a port
Institute of Electrical and Electronics Engineers
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Switch(config)#errdisable detect cause gbic-invalid
Switch(config)#errdisable detect cause psecure-violation

39. What is TCAM?
IEEE 802.3u
Half duplex
Switch(config)#interface range macro {name}
Ternary Content-Addressable Memory

40. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
Accelerated CEF (aCEF)
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
400 metres half duplex and 2000 metres full duplex
Tunnel

41. What is the TCAM Value and Mask for an Ethernet access list?
10 km
Full duplex
Creating the VLAN
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

42. What CEF optimisation replicates the entire FIB table among switch line cards?
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
The Layer 3 engine
Tunnel
Distributed CEF (dCEF)

43. Specifies the timer for automatic re-enabling of error-disabled ports
Packets that have been truncated before they were fully received
Switch(config)#errdisable recovery interval {seconds}
The Drop adjacency
American National Standards Institute

44. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
S = Short; L = Long; E = Extra-long
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#errdisable detect cause pagp-flap
1 -2 on one end with 3 -6 on the other end

45. Enables automatic re-enabling of error-disabled ports
Only temporarily for debugging purposes
IEEE 802.3
Switch(config)#errdisable recovery cause {all | {cause-name}}
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

46. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Configure the appropriate values manually on both ends of the link
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Creating the VLAN

47. What is the TCAM Value and Mask for an IGMP access list?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Off
By Mask/Value - where each unique mask has eight value patterns associated with it

48. What is the TCAM Value and Mask for an IP access list?
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Switch#show interfaces {interface}
Switch(config)#default interface {interface}
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

49. Removes entries from the CAM table
Switch#show errdisable recovery
The CEF epoch number
300 seconds
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

50. What is the default duplex mode of a Gigabit Ethernet interface?
Switch#show adjacency [{interface}] [summary | detail]
The Punt adjacency
Full duplex
CEF punt