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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 default error-disable detection causes?
Down - static access - trunk or tunnel
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Enable error-disable for all possible causes

2. What is the default age-out time for stale entries in the CAM table?
300 seconds
The CEF epoch number
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch(config)#errdisable detect cause bpduguard

3. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
Switch#show interfaces {interface} switchport
Switch(config)#errdisable detect cause rootguard
Switch(config)#interface vlan {vlan-id}
The Layer 3 engine

4. What is IEEE?
The Layer 3 forwarding engine
Institute of Electrical and Electronics Engineers
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
XENPAK - X2 - or SFP+

5. What is full duplex operation?
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config)#errdisable detect cause rootguard
Switch(config)#errdisable detect cause link-flap
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

6. What is 10GBASE-ER/EW?
Trunk
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

7. What is the TCAM Value and Mask for an IGMP access list?
Manually by administratively disabling and re-enabling the port
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Static access - trunk - tunnel or dynamic

8. What are the reasons for packets being dropped by CEF?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
XENPAK - X2 - or SFP+
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config-if)#no ip route-cache cef

9. What is the standard for 1000BASE-T?
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
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Security and QoS ACLs
IEEE 802.3ab

10. What is the operational mode of a switch port that uses DTP negotiation?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Security and QoS ACLs
Static access or trunk
10 km

11. Displays a list with status of all interfaces
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Switch#show interfaces status
The Layer 3 forwarding engine
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

12. What is LAN PHY used for?
CEF punt
Packets that have been truncated before they were fully received
Switch(config)#errdisable detect cause security-violation
Interconnecting switches in a campus network

13. What is 1000BASE-LX/LH?
CEF glean
40 km
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
The Discard adjacency

14. What are the classes of Physical Media Dependent (PMD) interfaces defined by IEEE 802.3ae?
Manually by administratively disabling and re-enabling the port
LAN PHY and WAN PHY
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

15. How are ports that are in error-disable state re-enabled by default?
CEF punt
Manually by administratively disabling and re-enabling the port
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch#show cef drop

16. Specifies the timer for automatic re-enabling of error-disabled ports
CEF glean
Switch(config)#errdisable recovery interval {seconds}
Cabling specifications for Gigabit Ethernet
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

17. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
Switch(config-if)#duplex {auto | full | half}
Collision domain
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)
The Punt adjacency

18. What is CEF?
Cisco Express Forwarding
American National Standards Institute
Half duplex
Creating the VLAN

19. What is FIB?
Switch(config)#errdisable detect cause unicast-flood
Forwarding Information Base
Switch(config)#interface range macro {name}
Switch(config-if)#duplex {auto | full | half}

20. What is WAN PHY used for?
Switch(config)#errdisable detect cause gbic-invalid
Trunk
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

21. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
When one station transmits at the same time as another on a shared medium
R = LAN PHY; W = WAN PHY
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Switch(config)#errdisable detect cause bpduguard

22. What is the maximum cabling distance for 10GBASE-LX4/LW4?
Slow response times - low throughput - runts and other input errors on the switch ports
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

23. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Static access - trunk - tunnel or dynamic
Switch(config-if)#duplex {auto | full | half}
400 metres half duplex and 2000 metres full duplex

24. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
Trunk
S = Short; L = Long; E = Extra-long
The Discard adjacency
Switch(config-if)#duplex {auto | full | half}

25. What CEF optimisation replicates the entire FIB table among switch line cards?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Distributed CEF (dCEF)
300 seconds
S = Short; L = Long; E = Extra-long

26. What is the prerequesite for creating a working SVI?
Creating the VLAN
IEEE 802.3z
Trunk
10 km

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

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28. What is the maximum cabling distance for 10GBASE-ER/EW?
40 km
15 metres
Numeric values that represent what action to take after the TCAM lookup occurs
In parallel revealing the best (longest) match in a single table lookup

29. How does topology based switching work?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
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#show cef not-cef-switched
Accelerated CEF (aCEF)

30. What changes are made to packets by the CEF packet rewrite engine just before forwarding?
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
Cisco Express Forwarding
40 km

31. What is 100BASE-TX?
Packets that have been truncated before they were fully received
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
CEF punt
IEEE 802.3z

32. What is the content of TCAM Result entries?
Numeric values that represent what action to take after the TCAM lookup occurs
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Trunk or dynamic
When one station transmits at the same time as another on a shared medium

33. What is the original standard for Ethernet (10 Mbps)?
IEEE 802.3
300 seconds
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
The CEF entry version number

34. What is half duplex operation?

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35. 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 ip cef
Native routed interface

36. What is the maximum cabling distance for 10GBASE-LR/LW?
XENPAK - X2 - or SFP+
10 km
Distributed CEF (dCEF)
UTP Fast Ethernet and Gigabit Ethernet

37. Disables CEF operation on an interface
Cabling specifications for 10 Gigabit Ethernet
Switch(config)#errdisable detect cause arp-inspection
Native routed interface
Switch(config-if)#no ip route-cache cef

38. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
CEF punt
SC or MT-RJ
Switch(config)#mac address-table aging-time {seconds}
Slow response times - low throughput - runts and other input errors on the switch ports

39. What is the maximum cabling distance for 10GBASE-CX4?
15 metres
Source MAC address; Port of arrival; VLAN; Time stamp
Switch(config)#errdisable detect cause pagp-flap
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

40. Configures a switch port with a static access VLAN assignment
Switch(config-if)#switchport access vlan {vlan}
In parallel revealing the best (longest) match in a single table lookup
Static access - trunk - tunnel or dynamic
Electromagnetic Interference

41. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
Trunk
The adjacency table
Institute of Electrical and Electronics Engineers
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

42. What is WWDM?
A switch port that has been shut down automatically due to a serious error condition
Wide-Wavelength Division Multiplexing
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Interconnecting switches in a campus network

43. Disables CEF operation globally
Trunk or dynamic
SVI
Slow response times - low throughput - runts and other input errors on the switch ports
Switch(config)#no ip cef

44. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Numeric values that represent what action to take after the TCAM lookup occurs
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

45. Adds a description to an interface configuration
Routing table and ARP table
Interconnecting switches in a campus network
Switch(config-if)#description {string}
On

46. What is the operational mode of a switch port that is a member of one VLAN?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Native routed interface
SC or MT-RJ
Static access

47. What is the maximum cabling distance for 1000BASE-ZX?
Switch(config)#errdisable detect cause ilpower
Cabling specifications for 10 Gigabit Ethernet
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
70 km for 9 micron SMF; 100 km for 8 micron SMF

48. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
SVI
SC fibre optic or RJ-45 UTP
The CEF epoch number
Off

49. What is the name of the CEF engine that maintains routing information in software?
70 km for 9 micron SMF; 100 km for 8 micron SMF
40 km
SVI
The Layer 3 engine

50. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
Trunk or dynamic
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
The table of learned MAC addresses - ports - and VLAN information