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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 RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
R = LAN PHY; W = WAN PHY
Full duplex
1 -2 on one end with 3 -6 on the other end

2. What is TCAM overflow?
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
1000BASE-T full duplex followed by 1000BASE-T half duplex
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

3. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
Native routed interface
The Punt adjacency
Switch(config)#errdisable detect cause rootguard
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

4. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
CEF punt
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Distributed CEF (dCEF)

5. What connectors can be used with GBIC modules?
SC fibre optic or RJ-45 UTP
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
40 km
Switch(config)#errdisable detect cause vmps

6. Displays dynamic CAM table entries
Switch(config-if)#no ip route-cache cef
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
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
On

7. How are ports that are in error-disable state re-enabled by default?
Switch(config)#interface vlan {vlan-id}
XENPAK - X2 - or SFP+
Manually by administratively disabling and re-enabling the port
The table of learned MAC addresses - ports - and VLAN information

8. What is the TCAM Value and Mask for an Ethernet access list?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Switch(config)#errdisable detect cause vmps
The CEF entry version number
The switch port falls back to default setting of half duplex

9. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Switch(config)#errdisable detect cause security-violation
Switch(config)#errdisable detect cause dtp-flap
Switch(config-if)#no switchport
Off

10. What is the TCAM Value and Mask for an IPX access list?
Switch(config-if)#no switchport
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
A switch port that has been shut down automatically due to a serious error condition

11. What is CEF?
Static access - trunk - tunnel or dynamic
Half duplex
The Layer 3 forwarding engine
Cisco Express Forwarding

12. What tables are maintained by the CEF Layer 3 engine?
Ternary Content-Addressable Memory
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Routing table and ARP table
Cisco Express Forwarding

13. What is 1000BASE-T?
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Content-Addressable Memory
IEEE 802.3

14. Enables error-disable for the presence of invalid GBIC or SFP modules
From 30 seconds to 86 -400 seconds (24 hours)
Creating the VLAN
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Switch(config)#errdisable detect cause gbic-invalid

15. What are the operational modes of a Layer 2 switched interface?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
SVI or native routed interface
Down - static access - trunk or tunnel

16. What is half duplex operation?

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17. Disables a switch port
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
The CEF entry version number
Switch(config-if)#shutdown
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

18. What is the DTP negotiation mode of a switch port configured as static access?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Off
Switch(config)#errdisable detect cause dhcp-rate-limit
10 km

19. What is the role of a Route Processor (RP) in first generation MLS?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Process the first packet in a traffic flow to determine the destination
Switched virtual interface (SVI)
On

20. What are the common PMD types for 10 Gigabit Ethernet?
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
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
Static access
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

21. What is ANSI?
Full duplex only
Cabling specifications for Gigabit Ethernet
1000BASE-T full duplex followed by 1000BASE-T half duplex
American National Standards Institute

22. What is a ternary combination?

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23. What is Cisco's old recommendation regarding switch port speed and duplex mode?
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
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-if)#no switchport
Configure the appropriate values manually on both ends of the link

24. Enables error-disable when a storm control threshold has been exceeded on a port
Only temporarily for debugging purposes
Switch#show interfaces {interface} switchport
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch(config)#errdisable detect cause storm-control

25. Configures a switch port with a static access VLAN assignment
Switch(config-if)#switchport access vlan {vlan}
XENPAK - X2 - or SFP+
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch#show ip cef

26. What is 1000BASE-CX?
Switch#show interfaces status err-disabled
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Collision domain
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

27. What is WAN PHY used for?
On
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
300 seconds
Dynamic

28. What is the default timer for automatic re-enabling of error-disabled ports?
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
300 seconds
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
FIB with adjacency table

29. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Distributed CEF (dCEF)
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Full duplex only
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

30. Enables error-disable when trunking encapsulation is flapping from one type to another
Switch(config)#errdisable detect cause dtp-flap
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch(config)#default interface {interface}
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

31. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
A name assigned to a ranges of interfaces
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)
S = Short; L = Long; E = Extra-long
10GbE operates only at full duplex

32. What is an interface-range macro?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
On
LOU registers
A name assigned to a ranges of interfaces

33. What is WWDM?
Manually by administratively disabling and re-enabling the port
Wide-Wavelength Division Multiplexing
Switch#show cef not-cef-switched
Switch(config)#errdisable recovery interval {seconds}

34. What are the names of CEF optimisation techniques using specialised forwarding hardware?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
IEEE 802.3ab
IEEE 802.3

35. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
The switch port falls back to default setting of half duplex
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
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)
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

36. Displays the entire Forwarding Information Base (FIB)
Route caching and topology based
Trunk
SC fibre optic or RJ-45 UTP
Switch#show ip cef

37. What is a SVI?
Switched virtual interface (SVI)
Store-and-forward
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
SC or MT-RJ

38. What is 10GBASE-ER/EW?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config-if)#switchport access vlan {vlan}
Cabling specifications for Gigabit Ethernet

39. Selects an interface-range macro and enters interface configuration mode
Switch(config)#errdisable detect cause rootguard
Switch(config)#interface range macro {name}
Switch(config)#errdisable detect cause bpduguard
Switch(config)#errdisable detect cause dhcp-rate-limit

40. Selects a switch port interface and enters interface configuration mode
Switch(config)#interface {type}{module}/{number}
SVI
Creating the VLAN
10 km

41. Displays a list with status of all interfaces
Distributed CEF (dCEF)
Switch#show interfaces status
Institute of Electrical and Electronics Engineers
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

42. What is the name of a Layer 3 physical interface on a switch?
Logical Operation Unit
Native routed interface
Full duplex
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

43. Enables error-disable for rate-limiting of DHCP snooping
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch#show interfaces {interface}
The CEF entry version number
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

44. Creates an interface-range macro
400 metres half duplex and 2000 metres full duplex
Switch(config)#interface range macro {name}
A switch port that has been shut down automatically due to a serious error condition
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

45. What is the maximum cabling distance for 10GBASE-CX4?
Native routed interface
15 metres
Down - static access - trunk or tunnel
Switch(config)#interface vlan {vlan-id}

46. What are GigaStack GBICs used for?
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch#show running-config interface {interface}
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

47. Enables error-disable for errors related to 802.1x security
Switch(config)#errdisable detect cause security-violation
Distributed CEF (dCEF)
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

48. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
Switch(config)#errdisable detect cause ilpower
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
XENPAK - X2 - or SFP+
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

49. What is 100BASE-T2?
The CEF entry version number
Half duplex
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
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

50. What is TCAM?
Switch(config)#interface {type}{module}/{number}
1 -2 on one end with 3 -6 on the other end
Ternary Content-Addressable Memory
Switch#show adjacency [{interface}] [summary | detail]