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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 connectors can be used with GBIC modules?
SC fibre optic or RJ-45 UTP
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Enable error-disable for all possible causes

2. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Creating the VLAN
Tunnel
A station must wait its turn to transmit; it can't transmit and receive at the same time
The adjacency table

3. What is the name of physical network segment where data packets can collide with one another when being sent?
10 km
They are dropped (ARP throttling)
Static access
Collision domain

4. What is a GigaStack GBIC?
Down - static access - trunk or tunnel
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
300 seconds
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance

5. Sets the administrative mode of a switch port to access
Creating the VLAN
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config-if)#switchport mode access
The Layer 3 engine

6. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
40 km
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
100 metres

7. Disables CEF operation on an interface
Switch(config)#interface {type}{module}/{number}
Switch(config-if)#no ip route-cache cef
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
The CEF epoch number

8. What is an interface-range macro?
A name assigned to a ranges of interfaces
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch(config)#errdisable detect cause security-violation

9. Displays static CAM table entries
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
IEEE 802.3ab
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

10. Selects an interface-range macro and enters interface configuration mode
The switch port falls back to default setting of half duplex
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#interface range macro {name}
American National Standards Institute

11. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Trunk
Switch(config)#errdisable detect cause channel-misconfig
CEF punt

12. Creates an interface-range macro
Static access or trunk
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch(config)#errdisable detect cause psecure-violation

13. What is the default duplex mode of a Gigabit Ethernet interface?
Full duplex
400 metres half duplex and 2000 metres full duplex
Cisco Express Forwarding
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

14. Specifies the timer for automatic re-enabling of error-disabled ports
On
Half duplex
Switch(config)#errdisable detect cause loopback
Switch(config)#errdisable recovery interval {seconds}

15. What are the names of CEF optimisation techniques using specialised forwarding hardware?
Cabling specifications for Gigabit Ethernet
American National Standards Institute
The Null adjacency
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

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

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17. What is 1000BASE-ZX?
A station must wait its turn to transmit; it can't transmit and receive at the same time
Native routed interface
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

18. Configures a switch port with a static access VLAN assignment
Switch(config)#errdisable detect cause arp-inspection
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan {vlan}
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)

19. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Switch(config)#errdisable detect cause vmps
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
The Drop adjacency
LAN PHY and WAN PHY

20. What is IEEE?
Institute of Electrical and Electronics Engineers
The Layer 3 engine
Switch(config)#mac address-table aging-time {seconds}
Switch(config)#errdisable detect cause storm-control

21. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
Switch(config)#interface {type}{module}/{number}
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
In TCAM Value entries

22. What are the Fast Ethernet autonegotiation selection priorities?
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
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)
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Process the first packet in a traffic flow to determine the destination

23. What is the operational mode of a switch port that is a member of one VLAN?
Switch#show interfaces status err-disabled
R = LAN PHY; W = WAN PHY
100 metres
Static access

24. What are the default error-disable detection causes?
By Mask/Value - where each unique mask has eight value patterns associated with it
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
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
Enable error-disable for all possible causes

25. Displays interface configuration information
LOU registers
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch#show ip cef
Switch#show running-config interface {interface}

26. What are the names of the two basic generations of MLS?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Route caching and topology based
Cisco Express Forwarding
Manually by administratively disabling and re-enabling the port

27. What is the name of a Layer 3 physical interface on a switch?
Cabling specifications for Gigabit Ethernet
Switch(config)#errdisable recovery interval {seconds}
Native routed interface
Logical Operation Unit

28. Adds a description to an interface configuration
1 -2 on one end with 3 -6 on the other end
Switch(config-if)#description {string}
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Route caching and topology based

29. What is the maximum cabling distance for 10GBASE-LR/LW?
10 km
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch#show cef drop

30. What is the maximum cabling distance for 10GBASE-SR/SW?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
The adjacency table

31. What is 10GBASE-LX4/LW4?
Switch(config)#errdisable detect cause bpduguard
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch(config)#default interface {interface}
300 seconds

32. What connectors can be used with SFP modules?
LC - MT-RJ or RJ-45
A name assigned to a ranges of interfaces
Switch#show ip cef
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

33. What is error-disable state?
Switch#show cef not-cef-switched
A switch port that has been shut down automatically due to a serious error condition
Off
The Layer 3 forwarding engine

34. What are the common cabling specifications for Gigabit Ethernet?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#errdisable detect cause psecure-violation
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Switch(config-if)#shutdown

35. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Switch(config)#errdisable detect cause pagp-flap
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch(config)#errdisable detect cause l2ptguard
Accelerated CEF (aCEF)

36. What is TCAM?
Ternary Content-Addressable Memory
Switch(config)#errdisable detect cause dtp-flap
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
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

37. What is 1000BASE-LX/LH?
Switched virtual interface (SVI)
Switch(config-if)#shutdown
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

38. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
Switch(config)#no ip cef
Ternary Content-Addressable Memory
Switch(config)#errdisable detect cause psecure-violation
1 -2 on one end with 3 -6 on the other end

39. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
Switch#show interfaces {interface}
Static access or trunk
ANSI X3T11 FibreChannel
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

40. How do Layer 2 switches provide isolation between hosts?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch(config)#default interface {interface}
Cabling specifications for 10 Gigabit Ethernet
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

41. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
When one station transmits at the same time as another on a shared medium
10 km
LOU registers
Switch(config-if)#no ip route-cache cef

42. What is the standard for 10 Gigabit Ethernet (10GbE)?
Switch(config-if)#duplex {auto | full | half}
IEEE 802.3ae
Source MAC address; Port of arrival; VLAN; Time stamp
Wide-Wavelength Division Multiplexing

43. What is the DTP negotiation mode of a switch port configured as static access?
Off
The Layer 3 engine
Switch#show running-config interface {interface}
From 30 seconds to 86 -400 seconds (24 hours)

44. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
The Discard adjacency
S = Short; L = Long; E = Extra-long
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

45. What is WWDM?
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
Switched virtual interface (SVI)
Switch(config)#errdisable detect cause dhcp-rate-limit
Wide-Wavelength Division Multiplexing

46. Displays the entire Forwarding Information Base (FIB)
10 km
Distributed CEF (dCEF)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch#show ip cef

47. How does topology based switching work?
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
The Discard adjacency
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
CEF punt

48. What tables are maintained by the CEF Layer 3 engine?
In parallel revealing the best (longest) match in a single table lookup
Routing table and ARP table
By Mask/Value - where each unique mask has eight value patterns associated with it
Trunk or dynamic

49. What is 100BASE-T2?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
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
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#errdisable detect cause link-flap

50. What is 100BASE-TX?
400 metres half duplex and 2000 metres full duplex
10 km
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP