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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 is the timer range for automatic re-enabling of error-disabled ports?
Switch(config-if)#no ip route-cache cef
SC fibre optic or RJ-45 UTP
From 30 seconds to 86 -400 seconds (24 hours)
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

2. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
Switch(config)#interface vlan {vlan-id}
Switch(config)#errdisable detect cause {all | {cause-name}}
Static access or dynamic
SC or MT-RJ

3. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
The Discard adjacency
Tunnel
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 km

4. When should CEF be disabled?
From 30 seconds to 86 -400 seconds (24 hours)
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Only temporarily for debugging purposes
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

5. What are the names of the two basic generations of MLS?
Process the first packet in a traffic flow to determine the destination
Route caching and topology based
Switch(config-if)#description {string}
IEEE 802.3z

6. What is the content of TCAM Result entries?
Native routed interface
Full duplex only
Numeric values that represent what action to take after the TCAM lookup occurs
Cabling specifications for 10 Gigabit Ethernet

7. Sets the administrative mode of a switch port to access
LC - MT-RJ or RJ-45
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Switch(config)#errdisable detect cause security-violation
Switch(config-if)#switchport mode access

8. Configures a switch port with a static access VLAN assignment
Switch(config)#errdisable detect cause psecure-violation
Switch(config-if)#switchport access vlan {vlan}
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch(config)#interface {type}{module}/{number}

9. What is 10GBASE-ER/EW?
Routing table and ARP table
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
By Mask/Value - where each unique mask has eight value patterns associated with it
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)

10. Creates a switched virtual interface (SVI) and enters interface configuration mode
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#no ip cef
Switch(config)#interface vlan {vlan-id}
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

11. Specifies the timer for automatic re-enabling of error-disabled ports
Dynamic
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable recovery interval {seconds}
By Mask/Value - where each unique mask has eight value patterns associated with it

12. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
Switch(config)#errdisable detect cause rootguard
Switch#show interfaces {interface}
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Numeric values that represent what action to take after the TCAM lookup occurs

13. What is unknown unicast flooding?
ANSI X3T11 FibreChannel
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Switch#show running-config interface {interface}

14. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
The Drop adjacency
Switch(config)#errdisable detect cause rootguard
The switch port falls back to default setting of half duplex
Switch#show cef not-cef-switched

15. What is the operational mode of a switch port that is a member of one VLAN?
Wide-Wavelength Division Multiplexing
Static access
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Down - static access - trunk or tunnel

16. What Ethernet ports allow for autonegotiation?
When one station transmits at the same time as another on a shared medium
UTP Fast Ethernet and Gigabit Ethernet
Carrier Sense Multiple Access Collision Detection
Routing table and ARP table

17. What denotes the number of times a CEF entry has been updated since the CEF table was created?
LAN PHY and WAN PHY
Only temporarily for debugging purposes
The CEF entry version number
IEEE 802.3z

18. Disables a switch port
Switch(config-if)#shutdown
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
The switch port falls back to default setting of half duplex
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

19. What is the maximum cabling distance for 10GBASE-CX4?
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
15 metres
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

20. What are the classes of Physical Media Dependent (PMD) interfaces defined by IEEE 802.3ae?
Cabling specifications for Gigabit Ethernet
Content-Addressable Memory
Feature Manager (FM) and Switching Database Manager (SDM)
LAN PHY and WAN PHY

21. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
The Punt adjacency
1 -2 on one end with 3 -6 on the other end
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
300 seconds

22. What is full duplex operation?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
IEEE 802.3z
Switch(config)#errdisable detect cause bpduguard
10GbE operates only at full duplex

23. What is EMI?
Electromagnetic Interference
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
Slow response times - low throughput - runts and other input errors on the switch ports
With a mask value in addition to binary values to decide which keys in a table are relevant

24. What is 10GBASE-CX4?
Full duplex only
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
IEEE 802.3

25. What is 1000BASE-T?
400 metres half duplex and 2000 metres full duplex
CEF glean
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
S = Short; L = Long; E = Extra-long

26. What is 1000BASE-CX?
Configure the appropriate values manually on both ends of the link
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
FIB with adjacency table
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

27. Displays error-disabled detection status
Switch#show interfaces {interface} switchport
Switch#show errdisable detect
The Layer 3 forwarding engine
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

28. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
The Layer 3 engine
Switch#show ip cef {interface} [detail]
A three-fold combination of 0 - 1 and X (don't care)

29. What CEF adjacency is used to discard packets because of access list or other policy action?
The Discard adjacency
Cabling specifications for Gigabit Ethernet
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
SC or MT-RJ

30. What is 100BASE-T4?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
LC - MT-RJ or RJ-45
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

31. What is the prerequesite for creating a working SVI?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Creating the VLAN
Dynamic
10 km

32. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
Logical Operation Unit
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
1 -2 on one end with 3 -6 on the other end
Process the first packet in a traffic flow to determine the destination

33. What is the maximum cabling distance for 10GBASE-ER/EW?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
40 km

34. Displays a list with status of all interfaces
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
The CEF epoch number
Switch#show interfaces status
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

35. Removes entries from the CAM table
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

36. What are the basic operations that a frame undergoes as it passes through a Layer 2 switch?
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Source MAC address; Port of arrival; VLAN; Time stamp
Switch(config)#errdisable recovery interval {seconds}
Native routed interface

37. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
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)
Tunnel
Switch#show ip cef {interface} [detail]
IEEE 802.3z

38. What is a SVI?
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 CEF entry version number
Switched virtual interface (SVI)
Switch(config)#errdisable recovery cause {all | {cause-name}}

39. What are the operational modes of a Layer 2 switched interface?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Down - static access - trunk or tunnel
70 km for 9 micron SMF; 100 km for 8 micron SMF
Creating the VLAN

40. What is the standard for 1000BASE-T?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
IEEE 802.3ab
Tunnel
Switch(config-if)#no switchport

41. What function is performed by the Switching Database Manager (SDM)?
In TCAM Value entries
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Tunnel
Security and QoS ACLs

42. Displays CEF Drop statistics with number of packets and reason for each line card
Switch#show cef drop
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Static access or trunk
Switch#show interfaces status

43. What is 1000BASE-SX?
400 metres half duplex and 2000 metres full duplex
Switch#show interfaces status
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

44. What information is stored in CAM?
The table of learned MAC addresses - ports - and VLAN information
Switch(config)#errdisable detect cause security-violation
Switch(config)#errdisable detect cause udld
Only temporarily for debugging purposes

45. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
IEEE 802.3u
Switch(config-if)#shutdown
The adjacency table
IEEE 802.3z

46. What are the Fast Ethernet autonegotiation selection priorities?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
SVI
Switch(config-if)#no switchport
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

47. What is Fast EtherChannel (FEC)?
Cabling specifications for 10 Gigabit Ethernet
The Discard adjacency
Security and QoS ACLs
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

48. What is MLS?
Multilayer Switching
Switch#show ip cef {interface} [detail]
Logical Operation Unit
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

49. What is a ternary combination?

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50. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
Security and QoS ACLs
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
R = LAN PHY; W = WAN PHY
Half duplex