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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 the Port Aggregation Protocol (PAgP) is flapping
Switch#show interfaces {interface} switchport
Switch(config)#errdisable detect cause pagp-flap
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-if)#speed {10 | 100 | 1000 | auto}

2. How are the TCAM Mask/Value pairs evaluated?
In parallel revealing the best (longest) match in a single table lookup
Carrier Sense Multiple Access Collision Detection
Slow response times - low throughput - runts and other input errors on the switch ports
Switch(config)#errdisable detect cause dhcp-rate-limit

3. What is the standard for Gigabit Ethernet (1000 Mbps)?
CEF punt
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
IEEE 802.3z

4. What is 100BASE-TX?
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
S = Short; L = Long; E = Extra-long
1000BASE-T full duplex followed by 1000BASE-T half duplex
The adjacency table

5. Displays a list with status of all interfaces
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
American National Standards Institute
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show interfaces status

6. What is the prerequesite for creating a working SVI?
CEF glean
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Store-and-forward
Creating the VLAN

7. What is the TCAM Value and Mask for an IGMP access list?
Switch(config)#errdisable detect cause rootguard
100 metres
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

8. What is error-disable state?
40 km
A switch port that has been shut down automatically due to a serious error condition
The Layer 3 engine
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

9. What is the maximum cabling distance for 10GBASE-ER/EW?
10 km
40 km
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
10 km

10. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
1000BASE-T full duplex followed by 1000BASE-T half duplex
Tunnel
Route caching and topology based
SVI or native routed interface

11. What is WAN PHY used for?
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
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Value - Mask - and Result (VMR)
100 metres

12. Enables error-disable for errors with Layer 2 Protocol Tunnelling
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Switch(config)#errdisable detect cause l2ptguard
On

13. What is the DTP negotiation mode of a switch port configured as static access?
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Off
SC or MT-RJ
Switch(config)#errdisable detect cause unicast-flood

14. What is the default duplex mode of a Gigabit Ethernet interface?
Full duplex
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Static access or trunk
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

15. What is TCAM?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
40 km
Switch(config)#errdisable detect cause arp-inspection
Ternary Content-Addressable Memory

16. What is 100BASE-T4?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Manually by administratively disabling and re-enabling the port
1000BASE-T full duplex followed by 1000BASE-T half duplex
The CEF entry version number

17. What changes are made to packets by the CEF packet rewrite engine just before forwarding?
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
Full duplex only
Half duplex
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

18. What is the DTP negotiation mode of a switch port configured as dynamic?
40 km
Switch(config)#errdisable detect cause bpduguard
On
Switch#show ip cef

19. What tables are maintained by the CEF Layer 3 engine?
Static access or dynamic
Route caching and topology based
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Routing table and ARP table

20. What is 10GBASE-LX4/LW4?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Trunk
Switch(config)#errdisable detect cause ilpower
On

21. What connectors can be used with GBIC modules?
SC fibre optic or RJ-45 UTP
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
25 metres
1000BASE-T full duplex followed by 1000BASE-T half duplex

22. What is 10GBASE-ER/EW?
Switch(config)#errdisable detect cause rootguard
Static access or trunk
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
The CEF entry version number

23. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
IEEE 802.3ab
Switch(config)#errdisable detect cause security-violation
Switch(config)#interface vlan {vlan-id}
ANSI X3T11 FibreChannel

24. Displays error-disabled detection status
Security and QoS ACLs
Value - Mask - and Result (VMR)
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show errdisable detect

25. How is link speed determined on Fast Ethernet links configured to autonegotiate?
By Mask/Value - where each unique mask has eight value patterns associated with it
400 metres half duplex and 2000 metres full duplex
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
In TCAM Value entries

26. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Switch(config)#default interface {interface}
LC - MT-RJ or RJ-45

27. What are the names of the two basic generations of MLS?
SVI
Switch#show interfaces status err-disabled
Carrier Sense Multiple Access Collision Detection
Route caching and topology based

28. What is 1000BASE-CX?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch(config)#errdisable detect cause arp-inspection
Switch(config)#interface range macro {name}

29. Disables a switch port
Switch(config)#interface {type}{module}/{number}
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config-if)#shutdown
25 metres

30. What are the default error-disable detection causes?
Packets that have been truncated before they were fully received
SC or MT-RJ
In TCAM Value entries
Enable error-disable for all possible causes

31. What is the name of the CEF engine that maintains routing information in software?
The table of learned MAC addresses - ports - and VLAN information
Switch#show running-config interface {interface}
The Layer 3 engine
IEEE 802.3

32. What are the operational modes of a Layer 2 switched interface?
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch(config)#errdisable detect cause dtp-flap
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Down - static access - trunk or tunnel

33. What is 10GBASE-CX4?
10GbE operates only at full duplex
Switch(config)#errdisable detect cause gbic-invalid
R = LAN PHY; W = WAN PHY
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

34. What is the maximum cabling distance for 10GBASE-LR/LW?
10 km
They are dropped (ARP throttling)
In TCAM Value entries
Routing table and ARP table

35. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
Only temporarily for debugging purposes
Source MAC address; Port of arrival; VLAN; Time stamp
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
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

36. Configures the maximum ageing time for entries in the MAC address table
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(config)#mac address-table aging-time {seconds}
The CEF epoch number
Switch(config)#errdisable detect cause bpduguard

37. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
25 metres
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Full duplex only
Switch(config)#errdisable recovery cause {all | {cause-name}}

38. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
400 metres half duplex and 2000 metres full duplex
Static access - trunk - tunnel or dynamic
Cisco Express Forwarding
The Punt adjacency

39. Displays the CAM table size with number of MAC addresses
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
SC fibre optic or RJ-45 UTP
Switch(config)#errdisable detect cause psecure-violation

40. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Feature Manager (FM) and Switching Database Manager (SDM)
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
The Null adjacency

41. Displays the entire Forwarding Information Base (FIB)
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch#show ip cef
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

42. What are the duplex modes of a GigaStack GBIC?
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
From 30 seconds to 86 -400 seconds (24 hours)
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

43. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
The CEF epoch number
Content-Addressable Memory
Switch(config)#interface {type}{module}/{number}
Dynamic

44. What is IEEE?
With a mask value in addition to binary values to decide which keys in a table are relevant
Institute of Electrical and Electronics Engineers
Enable error-disable for all possible causes
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

45. What is FIB?
SC fibre optic or RJ-45 UTP
Switch#show interfaces status err-disabled
Forwarding Information Base
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

46. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Creating the VLAN
Configure the appropriate values manually on both ends of the link
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
Switch(config-if)#shutdown

47. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
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 mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config-if)#speed {10 | 100 | 1000 | auto}
SVI or native routed interface

48. What is EMI?
When one station transmits at the same time as another on a shared medium
Electromagnetic Interference
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 storm-control

49. What is unknown unicast flooding?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
UTP Fast Ethernet and Gigabit Ethernet
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

50. What is half duplex operation?

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