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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. Adds a static entry to the MAC address table
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#errdisable detect cause psecure-violation
Switch(config)#errdisable detect cause storm-control
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

2. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Security and QoS ACLs
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
Configure the appropriate values manually on both ends of the link
Forwarding Information Base

3. What is the content of TCAM Result entries?
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config)#errdisable detect cause udld
Numeric values that represent what action to take after the TCAM lookup occurs
Switch(config)#errdisable detect cause pagp-flap

4. What is the maximum cabling distance for 1000BASE-CX?
25 metres
A name assigned to a ranges of interfaces
SVI or native routed interface
Switch(config)#errdisable detect cause udld

5. Enables error-disable for conditions that trigger port security configured on a port
Security and QoS ACLs
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Switch(config)#errdisable detect cause psecure-violation
A station must wait its turn to transmit; it can't transmit and receive at the same time

6. What is the maximum cabling distance for 10GBASE-LR/LW?
10 km
40 km
400 metres half duplex and 2000 metres full duplex
Wide-Wavelength Division Multiplexing

7. What is 10GBASE-ER/EW?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Full duplex only

8. Enables error-disable when a link is seen to be unidirectional
CEF punt
Switch#show errdisable detect
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch(config)#errdisable detect cause udld

9. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Switch(config)#errdisable detect cause {all | {cause-name}}
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)
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

10. Selects an interface-range macro and enters interface configuration mode
400 metres half duplex and 2000 metres full duplex
On
Switch(config)#interface range macro {name}
By Mask/Value - where each unique mask has eight value patterns associated with it

11. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
The adjacency table
10 km
Native routed interface
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

12. Displays the CAM table size with number of MAC addresses
Full duplex only
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
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#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

13. 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
Switch(config-if)#no switchport
Switch(config-if)#switchport mode access
Switch#show interfaces status err-disabled

14. What is the standard for Fast Ethernet (100 Mbps)?
The Drop adjacency
IEEE 802.3u
Source MAC address; Port of arrival; VLAN; Time stamp
Switch(config)#mac address-table aging-time {seconds}

15. What connectors can be used with GBIC modules?
Carrier Sense Multiple Access Collision Detection
SC fibre optic or RJ-45 UTP
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Store-and-forward

16. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Full duplex only
40 km
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)

17. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
A switch port that has been shut down automatically due to a serious error condition
Switch(config)#errdisable detect cause rootguard
Switch(config)#errdisable detect cause {all | {cause-name}}
IEEE 802.3

18. Enables error-disable for rate-limiting of DHCP snooping
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Off
Enable error-disable for all possible causes
Switch(config)#errdisable detect cause dhcp-rate-limit

19. What is error-disable state?
R = LAN PHY; W = WAN PHY
A switch port that has been shut down automatically due to a serious error condition
10 km
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

20. Displays the entire Forwarding Information Base (FIB)
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch#show ip cef
Switch(config)#errdisable detect cause channel-misconfig
Static access

21. What is unknown unicast flooding?
Switch#show errdisable detect
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch#show interfaces status

22. What is 100BASE-T2?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Slow response times - low throughput - runts and other input errors on the switch ports
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#errdisable detect cause loopback

23. What is CAM?
Switch#show interfaces {interface} switchport
CEF punt
Content-Addressable Memory
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

24. Enables error-disable for errors with dynamic ARP inspection
Switch(config)#errdisable detect cause arp-inspection
R = LAN PHY; W = WAN PHY
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
300 seconds

25. What information is recorded in CAM as frames arrive on a switch port?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Source MAC address; Port of arrival; VLAN; Time stamp
Switch(config)#errdisable detect cause security-violation
From 30 seconds to 86 -400 seconds (24 hours)

26. Displays CEF adjacency table information
SC fibre optic or RJ-45 UTP
Switch#show adjacency [{interface}] [summary | detail]
Route caching and topology based
Enable error-disable for all possible causes

27. Enables automatic re-enabling of error-disabled ports
Switch(config)#errdisable detect cause dtp-flap
Switch(config)#errdisable detect cause pagp-flap
Switch(config)#errdisable recovery cause {all | {cause-name}}
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

28. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config)#errdisable detect cause bpduguard
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch(config)#errdisable detect cause arp-inspection

29. Adds a description to an interface configuration
Configure the appropriate values manually on both ends of the link
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch#show errdisable detect
Switch(config-if)#description {string}

30. Creates an interface-range macro
Security and QoS ACLs
Static access or dynamic
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

31. What is TCAM?
10GbE operates only at full duplex
Ternary Content-Addressable Memory
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
UTP Fast Ethernet and Gigabit Ethernet

32. What are the common cabling specifications for Gigabit Ethernet?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Static access or dynamic
Store-and-forward

33. What is the maximum cabling distance for 1000BASE-SX?
Switch#show interfaces {interface} switchport
R = LAN PHY; W = WAN PHY
Configure the appropriate values manually on both ends of the link
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF

34. What is LAN PHY used for?
Interconnecting switches in a campus network
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Switch(config-if)#switchport mode access
The Punt adjacency

35. What is the name of a Layer 3 physical interface on a switch?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Static access - trunk - tunnel or dynamic
Native routed interface

36. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
A three-fold combination of 0 - 1 and X (don't care)
70 km for 9 micron SMF; 100 km for 8 micron SMF
The Discard adjacency
The switch port falls back to default setting of half duplex

37. What are the classes of Physical Media Dependent (PMD) interfaces defined by IEEE 802.3ae?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Accelerated CEF (aCEF)
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
LAN PHY and WAN PHY

38. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
Switch(config)#errdisable detect cause vmps
Switch#show cef drop
The Punt adjacency
Switch#show adjacency [{interface}] [summary | detail]

39. What are the basic operations that a frame undergoes as it passes through a Layer 2 switch?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Switch(config)#errdisable recovery cause {all | {cause-name}}

40. What are the reasons for packets being dropped by CEF?
Switch(config)#errdisable detect cause unicast-flood
Switch(config)#interface range macro {name}
Off
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

41. Displays administrative and operational status for a specified interface
Store-and-forward
Multilayer Switching
IEEE 802.3z
Switch#show interfaces {interface}

42. What is the name of the CEF engine that forwards packets in hardware?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
The Layer 3 forwarding engine
Routing table and ARP table
Security and QoS ACLs

43. What Ethernet ports allow for autonegotiation?
Tunnel
UTP Fast Ethernet and Gigabit Ethernet
25 metres
Store-and-forward

44. What is the TCAM Value and Mask for an ICMP access list?
IEEE 802.3u
Security and QoS ACLs
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Tunnel

45. What is the standard for Gigabit Ethernet (1000 Mbps)?
IEEE 802.3z
Switch(config)#mac address-table aging-time {seconds}
Switch(config)#errdisable detect cause storm-control
10GbE operates only at full duplex

46. What is 10GBASE-LR/LW?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
15 metres
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Switch(config-if)#switchport mode access

47. Enables error-disable for errors related to 802.1x security
Switched virtual interface (SVI)
Switch(config-if)#switchport access vlan {vlan}
Switch(config)#errdisable detect cause security-violation
SC or MT-RJ

48. What is WAN PHY used for?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Dynamic
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

49. What two IOS software components are involved in TCAM operation?
Feature Manager (FM) and Switching Database Manager (SDM)
Switch(config)#errdisable detect cause l2ptguard
The CEF entry version number
Creating the VLAN

50. What is the prerequesite for creating a working SVI?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Creating the VLAN
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Content-Addressable Memory