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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 error-disable when a storm control threshold has been exceeded on a port
Switch#show interfaces {interface} switchport
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show cef drop
Switch(config)#errdisable detect cause storm-control

2. Displays a list of all interfaces in an error-disabled state
SC or MT-RJ
Switch#show interfaces status err-disabled
Forwarding Information Base
Switch(config-if)#switchport access vlan {vlan}

3. How is the TCAM organised?
15 metres
By Mask/Value - where each unique mask has eight value patterns associated with it
Value - Mask - and Result (VMR)
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

4. What is the maximum cabling distance for 10GBASE-LR/LW?
10 km
Logical Operation Unit
The CEF epoch number
Switch(config)#errdisable detect cause udld

5. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
SVI or native routed interface
40 km
400 metres half duplex and 2000 metres full duplex
IEEE 802.3u

6. What information is stored in TCAM?
1 -2 on one end with 3 -6 on the other end
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
Security and QoS ACLs
CEF glean

7. Enables error-disable for errors with offering inline power
Switch(config)#errdisable detect cause ilpower
Switch#show interfaces status err-disabled
Switch(config)#errdisable recovery cause {all | {cause-name}}
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

8. What is an interface-range macro?
Switch#show running-config interface {interface}
A name assigned to a ranges of interfaces
Security and QoS ACLs
In parallel revealing the best (longest) match in a single table lookup

9. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
100 metres
Cabling specifications for 10 Gigabit Ethernet
300 seconds
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

10. What is 10GBASE-SR/SW?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Tunnel

11. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
Static access or dynamic
Switch#show interfaces status
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

12. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

13. What is ANSI?
Half duplex
American National Standards Institute
Electromagnetic Interference
Switch(config-if)#shutdown

14. What connectors can be used with GBIC modules?
CEF punt
SC fibre optic or RJ-45 UTP
Switch#show interfaces {interface}
Forwarding Information Base

15. What is 1000BASE-ZX?
The Punt adjacency
IEEE 802.3
They are dropped (ARP throttling)
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

16. What is the maximum cabling distance for 1000BASE-ZX?
Switched virtual interface (SVI)
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch#show adjacency [{interface}] [summary | detail]

17. Displays CEF Drop statistics with number of packets and reason for each line card
Switch#show cef drop
From 30 seconds to 86 -400 seconds (24 hours)
Switched virtual interface (SVI)
The adjacency table

18. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
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
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch(config)#errdisable detect cause dhcp-rate-limit

19. What denotes the number of times a CEF entry has been updated since the CEF table was created?
Static access - trunk - tunnel or dynamic
Cabling specifications for Gigabit Ethernet
The CEF entry version number
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

20. What combinations are TCAM entries composed of?
400 metres half duplex and 2000 metres full duplex
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Value - Mask - and Result (VMR)
The Layer 3 engine

21. 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
Switch(config)#errdisable detect cause arp-inspection
Switch(config)#errdisable detect cause unicast-flood
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

22. What is the default duplex mode of a Gigabit Ethernet interface?
The CEF epoch number
Off
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Full duplex

23. What are GigaStack GBICs used for?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
A station must wait its turn to transmit; it can't transmit and receive at the same time
R = LAN PHY; W = WAN PHY
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

24. Enables error-disable for conditions that trigger unicast flood blocking on a port
Switch(config)#errdisable detect cause l2ptguard
Switch(config)#interface vlan {vlan-id}
Switch(config)#errdisable detect cause unicast-flood
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

25. Enables error-disable detection
Switch#show ip cef {interface} [detail]
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config)#errdisable detect cause security-violation

26. What are the operational modes of a Layer 2 switched interface?
Full duplex
Down - static access - trunk or tunnel
S = Short; L = Long; E = Extra-long
The Layer 3 engine

27. What is the maximum cabling distance for 10GBASE-ER/EW?
40 km
Switch(config)#no ip cef
Switch#show errdisable recovery
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

28. What is WWDM?
Wide-Wavelength Division Multiplexing
Compiling Access Control Entries (ACE) into the TCAM table
Creating the VLAN
Switch#show interfaces status

29. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
They are dropped (ARP throttling)
Switch(config-if)#no switchport
Slow response times - low throughput - runts and other input errors on the switch ports
Switch#show interfaces status err-disabled

30. What are the common cabling specifications for Gigabit Ethernet?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
CEF glean
Switch(config-if)#switchport mode access
The Drop adjacency

31. What happens to subsequent packets destined for FIB entries in CEF glean state?
Switch(config-if)#no switchport
Switch(config)#errdisable recovery cause {all | {cause-name}}
They are dropped (ARP throttling)
Source MAC address; Port of arrival; VLAN; Time stamp

32. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Full duplex only
IEEE 802.3
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
On

33. What is 1000BASE-T?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch#show errdisable detect
Interconnecting switches in a campus network
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

34. What connectors can be used with SFP modules?
LC - MT-RJ or RJ-45
In parallel revealing the best (longest) match in a single table lookup
Switch(config)#mac address-table aging-time {seconds}
Cisco Express Forwarding

35. Displays the CAM table size with number of MAC addresses
Switch#show running-config interface {interface}
Electromagnetic Interference
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Forwarding Information Base

36. What is full duplex operation?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Numeric values that represent what action to take after the TCAM lookup occurs
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
IEEE 802.3ab

37. What are the types of layer 3 switched interfaces
Native routed interface
Switch(config)#errdisable recovery cause {all | {cause-name}}
SVI or native routed interface
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

38. What is 10BASE-T?
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config-if)#switchport mode access
Trunk or dynamic
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

39. What is the TCAM Value and Mask for an IPX access list?
The CEF epoch number
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Trunk or dynamic
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

40. What is 10GBASE-ER/EW?
Value - Mask - and Result (VMR)
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Full duplex
40 km

41. Displays the entire Forwarding Information Base (FIB)
15 metres
Configure the appropriate values manually on both ends of the link
Switch#show ip cef
Switch(config)#no ip cef

42. What is 100BASE-FX?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch#show cef drop

43. What is 1000BASE-LX/LH?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Switch(config)#interface range macro {name}
300 seconds
In TCAM Value entries

44. What is the operational mode of a switch port that uses DTP negotiation?
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Static access or trunk
SVI or native routed interface
Feature Manager (FM) and Switching Database Manager (SDM)

45. What is EMI?
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch(config)#errdisable detect cause l2ptguard
Tunnel
Electromagnetic Interference

46. Displays CEF adjacency table information
Off
Route caching and topology based
Full duplex
Switch#show adjacency [{interface}] [summary | detail]

47. Creates a switched virtual interface (SVI) and enters interface configuration mode
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
SC fibre optic or RJ-45 UTP
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 vlan {vlan-id}

48. Enables error-disable for when the port link state is flapping between the up and down states
Switch(config-if)#switchport access vlan {vlan}
In parallel revealing the best (longest) match in a single table lookup
Switch(config)#errdisable detect cause link-flap
The Null adjacency

49. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
Off
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
LOU registers

50. What CEF optimisation replicates the entire FIB table among switch line cards?
Switch(config)#errdisable detect cause loopback
Distributed CEF (dCEF)
Switch#show errdisable detect
Wide-Wavelength Division Multiplexing